When I am on Minecraft 1.21.2 or 1.21.3 and I am viewing another window instead of Minecraft, it sometimes crashes. This wasn't happening in 1.21.1. I don't know if this is related to the performance improvements in 1.21.3. I attached the crash screen.

Steps to reproduce:

1: Go into a Minecraft world (I was on a server all the times I experienced this. It happened on multiple different servers)

2: Look at a different window, like Microsoft Edge

3: Minecraft sometimes crashes, it may take a few tries or a few minutes