I have 2 worlds, both survival and creative on 19w08b. Whenever I leave the worlds and rejoin them, my tamed animals and other entities despawn, forcing me to find another wolf and cat in a village. I've tried naming them, and they still despawn.
Environment
MB: ASRock Fatal1ty X370 K4
GPU: GeForce GTX 960 + 760
CPU: AMD Ryzen 5 1500X 3.5GHz
RAM: 16GB GSKILL RIPJAWS DDR4-3200+
STORAGE: 2 SSD Samsung 850 EVO 250GB, 1 HDD 500GB
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However, this issue is a Duplicate of MC-144784.
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