The stairs in front of the doors at the villages are invisible and if you step on them it will glitch you.
At the top of the building the stairs are invisible too.
This bug does not happen in the desert village
Explanation from MC-87217:
When a village first loads in 15w35a/b, all stair blocks in the village will be invisible and will cause the player to stutter when walking on them. When the game is quit and the world re-loaded, the glitched blocks will no longer cause stuttering, however mobs will be able to spawn on them and the lighting glitch will remain. In both cases the blocks can not be interacted with. Updating the glitched blocks will fix the lighting glitch. The mobs that spawn on the glitched blocks spawn there due to the fact that when most hostile mobs spawn, the light level at the bottom spawning block is checked when spawning mobs. For example, as most hostile mobs need a light level below 8 to spawn, the game will check the block immediately
above the block that the mob will be standing on when it spawns. If this block is at light level 7 or below, a mob will spawn regardless of the light level of the block above, even if the bounding box of the mob is larger than that of the spawning block.
The lighting glitch is caused by the game generating the blocks but not rendering them, causing the blocks below to be at light level 0 (as stairs are opaque, the space they occupy is always at light level 0), and as the blocks exist for the game but not the player, the game treats the blocks as solid, however the player apparently does not, attempting to walk through the blocks as if they were non-solid. This causes the stuttering glitch. Reloading the world updates the blocks, causing them to effectively disappear, however this does not update the lighting engine, which will treat the blocks like any others at light level 0, and are therefore eligible for mob spawning.
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The stair on the building are invisible too..

I had the same problem but after clicking on them they appeared. when I exit the chunk it disappears again and can click it again. how ever when i exit the world and start it again it disappeared but didn't seem to come back when i clicked it.

I have this issue too, but the stairs are actually gone, not just invisible. There's not hitbox; it's air.

Try placing a block where the stair goes, and it will pop up, Avantir.
Can confirm. After reloading my world, all cobblestone and oak stairs and doors (even self-placed!) in the village disappeared (turned into air blocks) which is really annoying.

Wierd, it happened to me too, what a nuisance...

Also is anybody else having trouble with doors half-vanishing and bugging.

I am having the same problem. Also no doors appear on houses

Cobble Stairs
Wood Oak Stairs
Oak Doors (Not birch, spruce, only oak)
Iron Doors effected.
Turns to air upon world reload
Sometimes also (visually) disappear if you unload the chunks and come back.

I am encountering a similar issue with stairs. There is a village nearby, but not close enough for the stairs to be considered "in" the village. To produce the images, I placed the stairs, saved and exited the world, then reloaded the world. The stairs were all changed to air blocks with a lighting glitch. This seems to occur at any height as well.

Using MC-Edit I found out, that it gives any cobble stairs placed in 15w35b a block id of somewhat around 4000, which the minecraft client doesn't know and therefor just removes

I'm experiencing this bug too, but in a village I created from scratch by curing zombie villagers. Some of these reports list only the top half of the doors going missing, but I'm getting the bottom half disappearing.
This bug also manifests in another way... On my SMP server, the bug sometimes triggers while I'm in the village, but the server doesn't seem to notify my client that the doors were removed; So I can still see both halves of the doors, and I can even open and close them. However, if I try to go through a glitched door while my client thinks it's open, I'll start rubber-banding and the log fills up with "Player has moved wrongly" messages. If I then break the glitched door, I will get a door item back, which I then replace the door, and it's fixed for a while.
As others have mentioned, this bug appears to occur every time the affected chunk is loaded. As for when it occurs while the chunk is already loaded, it seems like it may have something to do with when a villager opens, closes, or goes through a door, but not every time; So I may be wrong about this relation.

I found that if you leave an area adn then return to it later, any newly placed aforemention steps doors etc, glitch out.

1.8.1 world loaded in 15w35b. Placed stairs (first screenshot). Saved and quit, relogged, have black squares there (second screenshot). I can place blocks in those spots.

For me:
This happens if I place stairs in any world created in or before 15w33c (in the screenshots, it's a 1.8.1 world I haven't touched in any way since Jan 15).
In a world created in 15w35b, placing stairs near where I spawned had them still there when I re-logged.

@Dominik's comment made me curious so I dug into the region file. When a stair or door (I just tested oak for both) get placed (any orientation), the following gets written out to the chunk:
Block: 0xFF
Data: 0xF
Add: 0xF
Since "Add" makes the block id = ((add_value << 8) + block_value), that'd have mcedit showing 4095 I think. (At least this is my understanding from the wiki).

my newly placed stairs disappear completely i place stairs move away from area come back and they're gone.

They also seem to be invisible to other players and I've seen oak doors affected as well. MC-87474 talks about this.

In SMP with my friend, only the person who placed the block could see or interact with the cobblestone stairs. It caused lighting errors and the person who couldn't see the block would get stuck and glitch out for a moment when they stepped into the place where they should be. The user who could not see the stairs could also place and break blocks through it.

i have the same issue, but for me when a friend steps on the stairs and i cant see it, my game will crash

I have noticed on a reload of the world, I had player heads MFH_Melon Heads (done by mojang) have vanished. They are there, just fully invisible. I broke one and saw the particle effect.

Confirmed in Multiplayer. Oak wood stairs placed my players are invisible and they disappear for them after awhile. Also, other players will get stuck in the invisible stairs and can't get out unless they suicide.

Weirdly, only some doors of the village (constructed from cured zombies) completely disappear and replaced by air block.

happens with iron doors as well

The village that I am finding this issue is, is constructed, with some spawned/cured zombies. I used spruce doors which were fine, some cobble stairs in my arena - which vanished. And player heads which also vanished, - but remained present and did not glitch me when standing on them. MHF_CoconutB MHF_CoconutG MHF_Melon MHF_Pumpkin and non offical MHF_Apple - all took a powder. They vanished from sight after I logged out then back in.
Some iron doors poofed too.
Steps in a village made with cured zombies vanished.

Fantastic, even the heads are visible again! well done!