My friend and me have been playing Minecraft in multiplayer mode.
However we can't multiplay since the end of last year.
There are two main problems.

Problem1.
When my friend invites me to friend's world, no sound effect and the game shows loading bar.
Finally I can't connect with friend's world.
(Please refer to attached video "Invitation failed".)

Problem2.
A few minutes after starting to multiplay, I can't open chests and my inventry.
(Please refer to attached video "bug1" and "bug2".)

Issues:
・Can't open chests
・Can't open my inventry
・Can't use crafting tables, looms, anvils, and so on
・Pressure plate not working
・All mobs are not walking
・My friend's avatar becomes invisible

Moreover, when I invite my friend to my world, same issues occur.
Those problems almost don't improve even if we restart.

Could you please fix this and help us ?
We hope to play Minecraft for long time, because this game is very fun.