Due to the new way Glowsquids now spawn in caves its causing issues where spawned zombies pick up the ink sacs and are therefore not despawning. I came across a cave that had around 50 zombies each holding an ink sac. Unfortunately i had to kill them all due to some lag it was causing so no screenshot of that situation but i found more today. This is on a snapshot server ive been running since 1.16 snapshots. Its Java 16 etc etc