I'm having problems, I can't play offline since the first beta of 1.16, solve this before version 1.17 arrives please, it's a great sadness to buy a game that before 1.16 was playable

I bought Minecraft to develop addons and textures for everyone but unfortunately the game is very bad sorry but the game needs to be playable offline 

Because all over the world many people don't have internet everywhere or many have bad internet and therefore the game needs to be playable of

Because in my Minecraft it presents the following

This game has flaws and errors 

Solve this urgent