SharePoint Column Formatting "@me" not resolving

(This post has been solved, as the error has disappeared.)

Hi there,

2 months ago I have built a workflow for a customer, where I use a SharePoint column to either display the item's status, or a Flow button if the item is in a certain state and the current user is responsible for that state. I did this by comparing the "@me" value (user's email address) with another people picker column. I have done that several times by now and it worked this time as well. 

As of today though, the "@me" value does not resolve any more, but is interpreted as a string. The "@currentField" is working however, so this seems to be an isolated error. I have tested with 2 different accounts and browser contexts on the same tenant. I also moved on to test this on another tenant. Has SharePoint somehow changed its implementation recently?

See SharePoint column formatting documentation for evidence that it should work: https://docs.microsoft.com/en-us/sharepoint/dev/declarative-customization/column-formatting

Also see my 2 attached screenshots showing the currently different behavior between "@me" and "@currentField" :

If this error persists, I would need to rebuild the whole workflow with a different approach. Please help.