After entering the end portal for return, when the ending started and I pressed skip and went back to the Stronghold bed, I looked at my inventory and saw that I had nothing, I should have had 52 levels, but I had 7 levels.
Just like the bug that was happening in 1.17.1000. This time I could move, but when I right clicked on a block that had a function, nothing happened.
If I save and reopen the game, the item does not come back, it goes back to normal.

The bug did not happen after the second time and did not happen in another world, so I don't know if I can reproduce it, but it could at least happen.

I will tell you as much as I can remember about the situation.

・Placed blocks around the towers
・Placed a chest at the end to store items
・Placed water on the obsidian at spawn point (water stream from above) 
・Died at least once at the end
・Broke some of the blocks at the end.
・Broke a block with my bare hands and used the torch in the center to retrieve EnderDragon's egg.
・Passed more than one experience through the gate
・Entered the Return Portal without recovering HP
・Entered without recovering full stomach
・Jumped through the gate while walking
・Pressed the move button during the ending

(I am using a translation, so it may contain some parts that are not correct.)