Subform code disappearing

Subform code disappearing

Over the last few weeks, I've noticed that Field Action code has been disappearing for subform.

The latest example is
Application: https://creator.zoho.com/essistmgmt/form/1713/scriptbuilder/
Subform: INITIAL_SERVICE_AGREEMENT
Field: SITE_ID
Note, the application is shared for support editing

I've previously added code but it has disappeared. Not only has the subform field actions disappeared but the version history disappeared too. Can you please investigate? I keep having to put the code back in.