Hello Kathryn P.,
Thanks for your reply! Yes, I’m creating my own WP theme as well as my own Gutenberg Blocks. One is a wrapper as I said, the other one can be repeated inside. Both are custom blocks by me.
I reviewed the issue, I’m not sure if it is related. My content does not disappear, it is still there. But I have to do the “restore block” every time I load the page, since there are empty lines within the InnerBlocks Wrapper. It only happens, when there is more than one children in the wrapper, as said. I tried to delete empty lines in the children block, but that doesn’t help.