Is it a known issue that field history tracking doesn't detect changes to a lookup field as the result of the parent object being deleted?
We had a big data integrity issue and was able to track it down a parent object being deleted. For example, CustomObject_c.Account_c, can get cleared if the related account is deleted, but it's not showing up in the history tracking. I've reviewed the tracking field history considerations in the help docs and it doesn't mention this limitation anywhere. Hoping to find out if this is expected behavior before I go down the long road of filing a bug ticket with Salesforce.