I have searched for the problem before write. Probably this bugs that one time was resolved, now is back in the version 1.14.1 . I have created one world in the version 1.12.0 and have build an pillager farm next to a outpost, and the pillagers captains at this time, spawns normaly, like 5 pillagers and one captain or something closely to this. aAter this i played a lot until the games reaseches the acctualy version 1.14.1 , and the spawn rate of the captain pillager was the same when i started in the 1.12.0 version, and recently me and my friends decided to start a new world for us to play together from the start. After we create, the first thing that i decided to build was the pillager farm, and i built one the same way that i build in my old world, next to a outpost, and i have noticed that the captain pillager spawn rarely in the outpost. I passed 2 in game days waiting to the captain spawn and only normal pillagers have spawned in the outpost.
So i think that who created an world before the 1.14.1 have the captain spawn rate normal like i said before in my old world, but who created after the actually version are have the same problem.
note: sorry for my bad english, im brazilian and tried hard to explain
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facing the same issue in 1.14.1, i isolated two spawning spots at an outpost spanning two chunks, built trident killer pods around them, and watched for several hours as many illagers spawned and died without a single captain spawning
note this does not seem to be related to the general bedrock spawning issues mentioned as fixed in 1.14.2, the spots are both spawning tons of illagers and i’ve taken care to ensure both chunks containing the outpost have solid blocks with sky access in every position

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100000% agree this is horrible, I have been trying to spawn any at all and the ones that do spawn are not pillager captains...
plugged up all the caves and lit them up, using xray as well... There is NOTHING stopping them from spawning and I have waited 20 mins for none to show up...
THIS NEEDS FIXED PLEASE 😞