Can't Disable Rounding Total in ERPNext Settings V12. Bug?

Frappe Framework Bug
1

It takes a long time to process then remains at Not Saved with an error:

disable%20round-off
disable%20round-off1365×649 62.1 KB

Installed Apps
ERPNext: v12.0.1 (version-12)

Frappe Framework: v12.0.1 (version-12)