When I was doing a raid in a village, around d the 3rd wave, I could never find the last pillager/illager.I even HEARD it and still nothing. Please fix this, I want the rewards from the raids, but can't do that if I can't finish it in the first place! And the after I had tried to quit (out of frustration) the game crashed! I love the concept, but I also would love to execute it.
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Is it possible the raid mobs travelled to the Nether?

@[Minecraft] Mega_Spud (Jay Wells) The raiders can accidentally go to a nearby Nether portal and can break the raid, resulting a raid defeated or victory.

The thing is, I have absolutely no Nether portal set up in my world. Even if that is the case somehow, it's still an AI issue and if not, a serious spawning issue

ive been having issues relating to this. the game seems to view "village chunks" y parameters all the way down to the bedrock... so wandering traders will spawn deep in caves, fill it with lamas and raid spawns will run into caves thinking they are "entering" the village. gonna test out the nether portal theory too... cuz that could easily mess with some of my builds.
edit: if a raid member enters a nether portal, their later death will not affect the raid wave mob count. you will have to destroy all your beds to end the raid.
2nd edit: even worse...
raid pack spawns can spawn on bedrock blocks...
raid pack spawns dont require sky over block to spawn...
raid pack spawns can split the levels they spawn on in a given chunk... some may spawn on the surface while others will spawn below the surface, even on bedrock.
on a final note, raid pack spawns seem to use a weird mash up of standard pack spawn rules. the spawn radially upto a distance of around 45m based onthe "first bed" boundary of the village. the player has to be within the aforementioned boundary. lastly, the spawn check can even allow pack spawns in the dead center of the aforementioned boundary if you force it via opaque blocks... raid farm anyone?

I've built silentwisperer's raid farm design and it tries to limit the available spawn blocks to a water platform at the top. But as shown in his video and happening to me in my realm, sometimes they spawn INSIDE solid walls and suffocate to death. One time a pillager spawned halfway out from the edge of the wall but was not pushed out, nor did it suffocate and I had to kill it manually.
I'll close this as a duplicate of MCPE-45532, but please also refer to MCPE-45183 which mentions raid mobs spawning in caves.
Sometimes they spawn in caves... once i could never finish a raid and i spent an hour digging... they should change the system so that illagers spawn on the surface.