After one week waiting for a Solution from Microsoft, I need to ask. In About 5 SharePoint Online Tenants the JSON Formatting in Sharepoint lists stopped working.
I Debugged the Scenario and find, that the Variable "HideSelection" works like a Switch to Turn off/on the JSON Columnn Formatting. If "HideSelection" = "true" the JSON Formatting works. If the "HideSelection" = "false" everything is broke.
This Problem appears last week and before this I worked really well.
I searched the web for a solution or other victims of this but I don't find anything.
I hope someone can help me.