I got the exact same problem and this fix solved it. Many thanks !
I have exactly the same issue, my content is in several blocks in a row layout. When I go on the edit page, all blocks are hided, only one block is showing “This block contains unexpected or invalid content.”, and if I do anything (resolve, convert to HTML or classic), I lose all my blocks and get only the last one, containing a shortcode.
In looking at the revisions, I saw that the “uniqueID” seems to change when the bloc show this errors.
[EDIT] After a few investigations, this error seems to appear repeatedly when adding a shortcode in a classic block. In using a shortcode block, it seems to be OK (for now).
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This reply was modified 7 years, 2 months ago by Aveias.
