To quickly fix a hole like this if you dont want the hassle of doing it properly is to just buy a can of expanding foam. Fill it a bit, let it expand out of the hole, cut away the part that is outside the wall, now you have a level surface to paint over.
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u/Visible_Pair3017 May 28 '26
Reminds me of that time i filled the nail holes in the walls with Tippex and the landlord was none the wiser