Editing page as Admin after creating with Super Admin breaks flipbox block

[Youdaman]

Hi, great plugin, love its simplicity.

I encountered this issue while building a site for a client: WordPress/gutenberg#15137

To reproduce, create a site with Multisite and as a Super Admin account create a page and add a Flipbox block, then create a standard Admin account and edit/save the page and the block breaks.

Here's a screenshot of what an Admin user sees after editing:

According to the WordPress github issue there is a solution you can possibly implement: WordPress/gutenberg#15137 (comment)