All Functions missing in Query UI

After a new install of Grafana 8.4.2 on CentOS7, there are no “functions” available in the query editor. What should be a menu is empty. The javascript console of the browser shows:
/api/datasources/proxy/1/functions Syntax Error: the string did not match the expected pattern.

I don’t know where to report bugs, so looking to see if anyone else has seen this…

I’m seeing the same with 8.4.2 at home on CentOS Stream 8, but not with 8.4.2 at work on Oracle Linux 7.9. When editing I’ll arrive at:
“Graphite encountered an unexpected error while handling your request. TypeError: unsupported operand type(s) for +: float and str” – so my search for the cause of the problem is going to start there.