Still having random objects disappear in playgrounds when switching between back to design mode

[mrjukes]

It says it was fixed in the pts update on 11/7.

Various objects will no longer disappear when returning back to Design mode.

 

However, I still have pebbles, pebblets, and other random objects disappear (seemingly randomly). It makes it really hard to design an escape room when intentionally places objectives keep disappearing.