When phasing through blocks in spectator mode, lag spikes will occur within moments and get progressively worse over time, eventually crashing the game.
Linked issues
is duplicated by 6
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When phasing through blocks in spectator mode, lag spikes will occur within moments and get progressively worse over time, eventually crashing the game.
Confirmed
Very Important
Performance
memory-leak
1.18 Pre-release 8
1.18 Release Candidate 1
Retrieved
It turns out that this issue only occurs when phasing through blocks in spectator mode, and it is still possible to play Minecraft worlds even after experiencing this issue, so it's not quite as critical as I thought.