I saw some similar issues reported, but couldn't find one which was exactly the same. Editing the NBT of a painting in any way at all seems to cause it to jump upwards (and sometimes to the right too). Tested with the following:
execute as @e[type=painting,limit=1] run data merge entity @s {Glowing:1b}execute as @e[type=painting,limit=1] run data merge entity @s {Invulnerable:1b}The bug only seems to occur for certain painting sizes however; for example, 1x1 and 2x1 paintings are unaffected while 2x1 and 4x4 paintings are.
Thank you for your report!
We're tracking this issue in MC-81870, so this ticket is being resolved and linked as a duplicate.
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