No slimes are spawning

Hey, I just made a slime farm ( on a slime chunk of course) and I have waited 30-35 minutes ( while moving ), and still no Slimes. It's in 1.14.4., do I have to change it ?

Help please.

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Yes, that means if you don't want to switch to 1.15 you either deal with broken mob spawning and switch to 1.14.4 or you deal with broken villagers and switch to 1.14.2.

Since I am already in 1.14.4, do I need to change to 1.15 ?

Ok, thanks you a lot !