Tadamichi Goto
Assigned
No issues.
Reported
MC-180207
World Update Crashes Game
Duplicate
MC-175736
TNT ignores block hitboxes
Duplicate
MC-174346
Minecraft refuses to load
Invalid
MC-174003
Can't rename items in anvils
Duplicate
MC-168429
Game not loading
Invalid
MC-162005
Chests will go transparent
Duplicate
MC-161594
Dark box around entities
Duplicate
Comments
I can confirm this in 20w12a
I don't have the launcher log anymore because the new launcher apparently doesn't save previous launcher logs, but I think I got the reason why: If you blow up a bunch of TNT, save and exit mid-explosion, and then come back later, loading the explosions overloads the RAM. To stop this from happening again, deleting the world was helpful. Please try that and see if you can replicate it.
No, that is a really old version of Minecraft, and my issue is that Java crashes ~10 minutes after Minecraft says that world loading is complete, not when the game is loading. Also, I think it is because there is something wrong with either the RAM or the Mojang-side server when I was testing this.
This is not a bug, Mojang intentionally made the game single-threaded because it only needs one thread to operate fast enough. There are mods that make the game multi-threaded though.