ODA REST Service config broke after using ${variable} in API Services – Error BOTS-50003

Hi,
While configuring a REST Service under Settings → API Services → REST Services in my ODA environment, I tried to use a dynamic variable like this:

${categoryValue}

I typed it directly into the Value field of the parameter.

After saving, everything broke. Now, when I go back to REST Services, the UI throws this

And I can no longer see, edit, or create any REST connections. It looks like the service is corrupted and prevents the whole section from loading.

Things I already tried:

• Clearing cache and cookies
• Using incognito / another browser
• Waiting for a refresh (still broken)

It seems like a corrupted REST config is stuck in the system and I have no way to delete it from the UI.