Sorry for the delay. I’m not really sure at this point since I cannot reproduce this in any project I have.
Would you be able to create a new level for your project and package just that level and send to me if it’s still doing this disappearing act? If it’s happening in the new level and while packaged I can at least see if I see the same results on my end and see if there is some workaround I can find with the packaged version to get it to not disappear, but no definite guarantees though.
Thanks.