Sometimes, props have a random chance to disappear when inside of a Creative island - they have hitboxes but are completely invisible and don’t show on the minimap. You can see them again by pickaxing, shooting, or cutting (with the phone) them, but explosives do not work; however of course, this is a tiring method.
I hate to break your heart but this issue was backlogged and will be addressed in “the future” which I doubt will ever come. I hate to be pessimistic but I have been fighting this without any updates regarding it.
i have a similar issue in creative where props disappear ( they get destroyed ) after launching the game (game mode ) for no reason , i reported this bug 3 days ago : props disappear . and i reported again : props disappear .