I've run Custom fields optimizer on '0 project' fields, so it changed Context from Global to No context so this fields is no longer available on screen.
Did I miss something or this feature is dangerous?
It shouldn't be dangerous, but I would check if it actually did anything int eh background. When I did it on the 0 context fields it didn't actually execute a change.
However, I would also suggest reaching out to your users and setting a delete date for those fields. If they aren't being used they are causing unnecessary overhead in the instance.
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