Loading a superflat world runs everything supersmooth. Until you spawn mobs, they act really messy. Server says it can't keep up, and I didn't change system time. Block lag doesn't exist, just messy mob movement + not keeping up server.
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apparently the issue doesn't occur on old superflat worlds...
Apparently copying the level.dat from a non-superflat world to a superflat world fixes it. Changing the generatorName
NBT-tag to default doesn't fix it, nor does removing the generatorOptions. Must be another tag doing it, but it's defintely one in the level.dat...