Issues affecting firewall rules API with some expressions.

Orinal source post by Cloudflare

Oct 13, 04:06 UTC
Resolved - Cloudflare has resolved the issue and service have resumed normal operation.

Oct 13, 02:50 UTC
Monitoring - A fix has been implemented and we are monitoring the results.

Oct 13, 02:45 UTC
Identified - This issue has been identified as limited to the Firewall rule builder UI; the Firewall APIs are working correctly.

Oct 13, 02:33 UTC
Investigating - Cloudflare is aware of, and investigating issues reported with the firewall rules API with some expressions.

This does not affect Firewall operation at the edge.