Reusable Blocks are Disappearing along with the content they were created with

I have searched through the forum and found others with this same issue, however no solutions were found in the posts and they are all closed to further commenting.

When I add a table through the block overflow menu>Add to Reusable Blocks – the symbol no longer looks like a table but it looks like two diamonds overlapping. And then when I add this reusable block to another page, it adds as a big long plus sign button and doesn’t show the table. When I update and preview the page, the table still does not appear. I have not had this issue previously so I’m unsure what’s happening.

• This topic was modified 2 years, 5 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

The page I need help with: [log in to see the link]