Strongholds sometimes don't generate the End Portal

Same problem with me as well. I'm playing on Windows 10 version 1.2.8. I have a stronghold that seems to not have an end portal. My world seed is 4879820. The staircase leading to my stronghold is at 691, 20, -1100. If someone could check if I in fact do not have an end portal in my stronghold, that would be greatly appreciated. Thanks.

@Andrew Kennedy
The eyes took me up into solid rock at 688, 30, -1104 with no portal, structure, water, cave in sight. I'm not sure what bugged it out but that at that initial split staircase the down staircase hallway doubles back on itself which maybe aborts the generation? There is also the floating torch near where the split staircase goes up to support that hypothesis. I would code it so that generation starts from the end portal though, so that doesn't make too much sense. The other possibility is that 688,-1104 is a chunk boundary, so maybe when generation starts it should run a check and move the portal to the middle of the adjacent chunk.

Head to +250, +650 and the eyes will take you to a good, verified stronghold. You will need a lot of eyes though because it's a long ways off. Also under a village though, so that helps.

Edit: before deleting the copy of the world, I thought I would see if I could find the portal without flying or instant breaking blocks. (Not without difficulty) The 2nd stronghold is in several disconnected sections and I had to go through caves to find the one with the portal. In so doing, I learned that the eyes do not point to the portal, which seems like its own separate bug report! The eyes for the second stronghold also point to a chunk boundary, btw. It's possible then, that thete is a portal at your original stronghold but I didn't find it either. I spent quite a bit of time exploring around your first stronghold and did not find even a second segment of stronghold, although I did find the obvious ravine and a less obvious ine to the west connected to the cave systems there. I scanned the ravine walls for stone brick but didn't see any.

I had a bad stronghold in a world that I since abandoned. I was hoping this would give me some insight to it but it did not.

I found a Stronghold that only generated the stairs and a Library. The seed is 1526307400 and the Stronghold is at -348, 43, 2180. I put on an xray texture pack to check it and it turns out the Stronghold did not generate anything else.

I tested the seed on v1.2.10.1 on my Xbox one afterwards and it is the same result. This means this bug is still present on 1.2.10.1

To check future stronghold more easily, this is the xray texture pack I used to see the entire Stronghold: http://www.mediafire.com/file/1i25xsiyqc1dsp4/XrayForUnderground.mcpack

I also have this issue

This stronghold seems to only have an entrance and no portal.

Seed: -396676922

Stronghold at -1150, 41, -235

I am leaving a comment for mega_spud. I found stronghold in survival and creative but no end portal. I am sending screenshot from creative mode. Ender eyes went inside wall of room with stone slab arch and stopped. I destroyed some walls to find eyes but no end portal

I am going to send some screenshots from stronghold in survival mode. I have seen pictures of end portals with a lava pit on either side so I am sending what might be half of a end portal room.

screenshot I am sending show what might be start of stairs to end portal

the chest were not there I put them there

Affects 1.11

Affects 1.14.1

Thank you for your report!
However, this issue has been closed as Working as Intended.

There is a chance that strongholds may not generate with a portal room, but infinite worlds will have multiple strongholds within them.

Remember not all differences between game versions/platforms of Minecraft are bugs. If you need help or have a suggestion you might like to follow a link below.

Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki

It is bad to have to spend an ender's eye to reach stronghold and not have a portal.

@srnatthan Yep.

I don't understand why this is intended though, it can be so annoying when you go to a stronghold and no end portal is present, it has happened to me more times then I can count

It's not that Mojang intended to generate a stronghold without a portal, it's that when they designed the algorithms for structure generation they had to compromise. Realism requires a certain degree of unpredictability, that is, randomness, but randomness also creates a risk of overlapping structures where the one generated later overwrites the earlier one. I'm not sure it's even possible to eliminate that risk, but doing so would require a fast computer with a lot of memory because the number of structures in a world is huge and the cost of checking for overlaps would increase as the square of that number. So the "intended" part is that Mojang chose a balance that tries not to generate overlaps/overwrites too often. Strongholds are a special case because the portal is the main reason people look for one, so if it doesn't have one it's frustrating and annoying.

I've had this problem as well, and I thought it was just bad luck, but it's possible that as new structures get added to the game, this issue becomes more and more of a problem. I think Mojang is aware of it, because I know from experience that the algorithm generating strongholds changed at least once in the past year (because a stronghold I knew about from a Creative copy was no longer there when I later tried to find it in Survival). But you might like to register a suggestion on the Feedback site that stronghold portals be given special protection from being overwritten. The devs might be able to figure out a way to do it.

Can't they just... you know, stop being lazy and fixing the overlap, perhaps by moving one structure slightly to the side when that happens?

It's not like they place all of the structure in every seed by hand! You're talking as if you know of a way by which they could stop overlap without messing up every single structure in every seed in the game. There are specific algorithms used to generate every Minecraft structure, and in order to "move" any structure, they need to change these algorithms, altering almost every aspect of Minecraft's world generation. Nobody could fully understand the details of the code and process that goes into the game other than its developers, and sure they would use the code algorithms that are most beneficial to all aspects of the game. Minecraft is a game that has been developing for more than 10 YEARS! Sure you don't think that the developers would be goofing around all that time. I don't work for Mojang and I don't know any of the employees personally, but I do get furious when people are inconsiderate. If you want to be of any help, only give constructive feedback, perhaps if you know of a way by which this could get fixed. Thank you.

I propose one idea for a solution to this problem: Generation assistant blocks. Use a block like say, the old stonecutter or tile.end_gateway.name, anything as a marker, then generate the portal room over anything in its way.

Pros: prevents overlapping of the portal frame (or any other part of the room) 

Cons: if the marker is overlapped, it won't generate. Can destroy other parts of the stronghold. Is impractical to implement.

It’s about the generation and seed. 😛

A way of fixing the missing portal room is some intelligent post-processing to add it in as the last structure if it wasn't added earlier.

Assume that the structure generation keeps a list of valid and unused connection points (doorways, etc).

At the end of stronghold generation, if the portal room was not generated:
(1) go through all of the unused connection points and find those that lead to a place where a portal room can be placed without overlapping. If any were found, choose one at random and place the portal room there.
If no suitable connection points were found at (1):
(2) go through all of the unused connection points and find any that can be extended to a location outside of the structure where a portal room can be placed without overlapping. Choose one at random. Extend this connection point with the particular corridor pieces it needs to reach the location. Place the portal room there. (This is easier to do if these connection points are limited to those that need only one corridor piece to reach a suitable location for the portal room, at the cost of failing more often).
If no suitable connection points were found at (2):
(3) Find a suitable place close to the stronghold and place the portal room there without a connection to the rest of the structure. Create a locator map for the portal room. Alter the loot table for a loot chest in the stronghold and add the locator map to that chest. (For this to work, the stronghold must have at least one loot chest. If there are none, create one.) This last step will probably be unnecessary, but it's included in case the stronghold generates weirdly. It's also better to have a stronghold with a disconnected portal room than none at all.

Other possible fixes:

• Include a dummy structure in the structure pool that is the same size as the portal room. These contain nothing, but can reserve space for the portal room. These can be generated within the stronghold like other structures. A portal room can overwrite these but no other structure can overwrite them until a portal room has been generated. When a portal room is generated, all dummy structures are removed and are no longer available for selection in the structure pool.

Reopened for review.

This is supposed to work

I am saying it kinda late but because of the 64-bits seeds to match the java seeds. the strongholds that are incomplete are only strongholds generated under a village.

I don't know if it would be a good idea and i am sure my suggestion may take a lot of changes and surely will be a pain in the butt but my idea is to try and mimic the way the strongholds generate in the java ( inside of circles  around of spawn).

Pros

It aims towards the idea of parity between the two editions on how the structures are generated in the world.

It already kind of exists because every stronghold doesn't have one village above it.

Cons

It will take a LOT of time and a Lot changes in the code of the game and will be very frustrating for person/people who will do it.

Many changes will happen to generation of the structures.

There won't be infinity strongholds.(i dont think anyone cares about this one)

In my opinion it's not worthy that needs to be spent that much of energy for this bug.

I am sure devs have at least one better idea than this.