I am suddenly having the same issue here in New Zealand. Flows that have worked for a long time and still run, now cannot be saved even with no edits. The error occurs on out-of-the-box Flows as well.
The error text is: The template validation failed: 'The 'recurrence' property of template trigger 'When_a_file_is_created_(properties_only)' at line '1' and column '1265' is not defined or not valid.'.
I think Microsoft have broken something. Hopefully the issue will be fixed in the next day or so.
Screenshots:
Test Flow with error message
The offending script