I purchased PrestonPlayz Craftable Houses.  It functioned on my son's Fire HD 8 (7th gen) initially for about a month.  Now, it shows up in my inventory as "incompatible".  If I click on it in my son's inventory, I get a screen that states "We're unable to connect to the Marketplace..."  All other marketplace online functions work fine.

My other child's Fire HD 8 (10th gen) tablet running Fire OS 7.3.1.9 runs the craftable houses world fine.  Both Fire tables are running Minecraft 1.16.221

BTW, I had to select "Affects Version/s" = 1.16.221 Hotfix to submit this bug.  However, our Minecraft versions shows no indication of a"Hotfix".