I experienced the same bug. It first appeared on 1.21.6, but it is also present in 1.21.7 rc-1. The effect worsens over time. I have the default 2GB of ram allocated.
Observations:
-Exiting a world and re-entering does not fix it. Only closing Minecraft and re-launching it does.
-Effect takes a few minutes to appear. Memory starts around 20%, but then climbs to 100% after a few minutes.
-Wandering around worsens it.
-Alongside FPS being low, GPU sometimes hits 100%, and so does memory.
BashfulGoose8
I experienced the same bug. It first appeared on 1.21.6, but it is also present in 1.21.7 rc-1. The effect worsens over time. I have the default 2GB of ram allocated.
Observations:
-Exiting a world and re-entering does not fix it. Only closing Minecraft and re-launching it does.
-Effect takes a few minutes to appear. Memory starts around 20%, but then climbs to 100% after a few minutes.
-Wandering around worsens it.
-Alongside FPS being low, GPU sometimes hits 100%, and so does memory.