slimes are not spawning in slime chunks.
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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.
Also experiencing this issue
Small edit: They still spawn in swamps correctly from what I can tell
I have the same problem, they don't spawn anywhere only with /summon slime
Indeed they have stopped spawning in slime chunks, however, they do still spawn at swamps at a lower rate than before 1.14.

Duplicates MC-153326.
I have the same problem, the world was created in 1.12. I tried recreating it in version 1.14.3 but slimes still do not spawn on the same chunk. I used Chunkbase's Slime chunk finder and Amidst to find these slime chunks.
FIXED: If you are using Optifine, disable Lazy Chunk Loading in Video Settings >> Performance
@William Smith Thanks! that helped a lot
william smith what that do