Disappeared Schema

Hi everyone,

I have successfully created schema in the webui server. I want to get draft version of active schema as below. Firstly, I open the draft version of my category schema and set the valid from date in future.

   Problem is : when I click Save button, draft version is destroyed as below. After Save, category schema and subject profile disappear. Similarly, when I make active schema from draft version, I often encounter this problem.  Sametimes, I can save schema correctly, but not frequently.

Does it require OSS note?

Thanks

Vildan