I've encountered this issue several times while pregenerating my servers 1.16 map. There is no crash report to share as I have to force kill the process.

I've given the server 24GB of memory to use. It plots along at 5-8GB then suddenly jumps to using the full 24GB, CPU drops to zero, and the console is unresponsive.

This is NOT a memory leak. The memory does not go away gradually, it is consumed all at once. I'm not sure if it all happens in a single tick or not, but I think it is likely.

I have experienced this issue while generating all worlds - including the end.

This may be a vanilla bug but given the lack of a repro I'm not able to verify.