mobs pathfind to air blocks

Do you mean that they are walking off of cliffs, and are you able to provide screenshots?

@Sonic I don't know about the dude who reported it but if so, then yes. This behavior is more common right now. Been playing today for some time and at some point one of my 4 villagers (who I have since 1.14 pre1) died and I was trying to figure out how. Next day I notice all of them going up the nearby hill and jumping down from it, mostly 3-4 blocks heights but still. They go on the roofs, hills and jump taking damage, repeating during the day and if "lucky" they just die.
This is something messed up in 1.14.1 Pre-1 because I did not see them doing it before (or at least not that often).

Oh one more thing worth to mention is slabs. They do that from 2 and half blocks high walls as well, probably thinking that it's just 2 blocks and is safe to go that way.

Yes I mean in Minecraft 1.14.1 pre 1 the mobs simply walk off edges say in a mob farm with no border just into open air with no regards for their safety I can’t provide screenshots because it’s happens so randomly and didn’t capture it I’ll give it a go tomorrow

okay ive added some screen shots as you can see the pigment are pathfinding off of the platforms

Does this still happen in 1.14.4? This might have been fixed in 1.14.4 Pre-Release 2, along with MC-151810.