To reproduce.
Open Minecraft, wait a few seconds for the game to load your MC account. And it crashes, same thing with the pause menu.
And as you can also see with the other screenshots, it doesn't crash if account didn't properly load
Edit:
If the profile button loads. It crashes
I noticed that when I have a resource pack that changes the ui, the profile button isn't there. My account loads, it doesn't crash. And on my first assumption I thought it was the account loading in.
But I think it's the profile button, loading on offline mode that crashes Minecraft.
Because everytime I take the resource pack off, and the profile button appears it crashes
-Turning the internet on fixes the problem temporarily. But the problem still occurs. After a while
Problem doesn't occur when internet is on
Problem doesn't occur when you've recently turned off internet
Problem does occur after a while of being offline
Problem does occur everytime the profile button appears (Main Menu and Pause Menu)
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I don't really know what happened. But it's fixed? I tried opening Minecraft with internet on, and it fixed it. It doesn't crash anymore. Turned off the internet, it doesn't crash. Soo...
Maybe there was a problem with my account not syncing? Idk, but it's fixed so I'd take it