Mob AI ignoring damage dealing blocks when randomly walking around/not fleeing when hit by them

Affects 18w49a. Also berry bushes should be added to the list.

As of 19w02a, campfires seem to be affected as well, see MC-142066

However mobs that die because of the campfire should drop cooked meat

Added a video of this happening in version:
1.14 Pre-Release 2

Villagers ignoring campfires

Still in 1.14 Pre-Release 5

Still in 1.14.1 Release

Still in 1.14.2 Pre-Release 1 and 1.14.2 Pre-Release 2

Villagers are no longer affected.

still happens in 1.15.2

Cat killed itself. Was sad

Glad I found this. My dog almost died while I was building, had to push it off the campfire because it just stood there.

Still in 20w17 at least:

Took a couple of dogs caving with me... one of them tried to swim up a falling lava stream, after I'd already quenched the base – there was plenty of room. "Dog tried to swim in lava" – yep, they sure did! The other wandered across the corner of a half-quenched lava pool, and burned to death, and had no obvious reason to want to go down that corridor.

Related, and possibly the same bug. I noticed that when standing on magma blocks, mobs make no effort to get off of them even when they easily can, just stand there taking damage until they either die or they randomly wander off. Just like the villager on that cactus in the pic. Tested this in 1.16 Pre 3

😞 Yeah, still an issue. Had a parrot suicide on a berry bush outside of my house because they decided it was a great place to settle down to rest.

In 20w49a

Can confirm in 20w51a.

can confirm for 21w07a

In 21w10a

In 21w13a

In 21w15a

In 21w17a

Affects 21w18a

Affects 1.17

Can confirm in 21w40a.

Affects 1.20

Can confirm in 1.21.3 

@unknown Do you have any reproduction steps you could supply for this issue, since you just confirmed it? 

Place a magma block 3 blocks in front of the player and 4 more blocks (2 extending left and right each), then lure a villager with food.

Observed result: The villager takes damage from the magma block.

Expected results: The villager can path find around the magma blocks to go towards the player.

Also speaking about villagers, I want to highlight a few other serious bugs:

MCPE-172251*

MCPE-42912*

MCPE-67222*

MCPE-41432

MC-140452*

MC-140383*

MC-238689

MC-220538*

MC-192711

MC-140619*

MC-153904*

MC-256129*

MC-277889

*Particularly important 

The villagers pathfind around the magma for me, and doesn't take damage. If I close the food in with magma blocks they will just stare at it. Do you have any other reproducing steps?