same issue here. Have 3 slime chunks and they don't spawn. Also they are not spawning in swamps.
Edit: in 1.14.2 they were spawning.
same happening here. defended 3 raids, 1 yesterday and 2 today and crashed the three times.
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Keeps happening to me on 1.14.1 world. Have 2 villagers each one bounded to its working station and from day to the other they lost their brain info. Have already got 2 new villagers, got them master and in a few days they've lost brain info again... This is annoying...
Having the same problem here, running 1.14.3. I've built a witch farm in a 13x13 chunk "hole" and I'm playing with a render distance of 8 so no mobs can spawn outside of the perimeter. Also the guardian farm was working relatively well and now if it spawns 4/5 guardians per minute is too good. I've also tried 1.14.4-pre6 and the behavior is the same.