If you setup a command block with the command "/health set 1" and make it always active and repeat and die to lava, the respawn button will not work for about 10 seconds then it will work and if you try to die at all even /kill cannot kill you and if you go in 3rd person it will show you in the death animation glitched

To fix it just disable the command block and type /health set @s 0

Alright, no problem

Closing this, as I don't think there will be a way I can fix this