Specifying the --server parameter when starting the game, causes the game to crash

Add the --server parameter when starting the game, the game will crash.

 
In fact, this problem has existed since the 21w10a update.

How to reproduce this problem

Enter the startup parameter --server=127.0.0.1 in the launcher and start game.

 

Note:

My friend tried to fix it in the following way:

 And it work well.

 (Mojang mappings)