Step 1. Create a standard portal with obsidian
Step 2. Issue a fill replace command on the portal with air
Example:
/fill ~1 ~1 ~1 ~2 ~3 ~1 air replace portal
Result:
Portal will destroy instead of replace
Linked issues
duplicates 1
Attachments
Comments 11

Thank you for your report!
We're actually already tracking this issue at MC-52844, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Thank you for your moderation!
You're not actually already tracking this issue at MC-52844, so you should reopen this ticket as it is not a duplicate.
If you would like to confirm my clear instructions and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to read the description to see if the issue is not related to what has already been mentioned.

MC-52844 is a bug that claims you cannot fill nether portals - which you can.
That is not this bug.
Please read carefully the description that I included, as sometimes unrelated bugs can have similar titles.
This bug pertains solely to fill replace - and the fact the filling a portal defaults to destroy (shatters) even when you put replace in the command. This is unlike the standard of the command used with other blocks.
This did not happen in 1.12. In the previous version of Minecraft, the portal block would be replaced without shattering when the fill replace command was issued.
Thank you. I expect your swift reopening of this bug as it is clearly not a duplicate of and issue that does not exist,.
Can confirm in 20w51a.
Can confirm in 21w06a. Here are some steps to reproduce this issue just to make life easier:
Steps to Reproduce:
Run the following commands:
/fill ~1 ~ ~ ~4 ~4 ~ minecraft:obsidian
/fill ~3 ~1 ~ ~2 ~3 ~ minecraft:air
/setblock ~2 ~1 ~ minecraft:fire
/fill ~3 ~1 ~ ~2 ~3 ~ minecraft:air replace minecraft:nether_portal
→ ❌ Notice how upon running the final command, breaking particles and sounds can be heard from the nether portal.
Can confirm in 1.16.5 and 21w08b.
Can confirm in 1.17.1. Video attached.
Can confirm in 1.18.1.
Marked as relates to MC-188223, but in actuallity, it is the same core issue.
Relates to MC-141272