When you create or copy a feature, its ID is automatically created based on the product code. The ID is a combination of the product code and an auto number (and that is perfectly fine). But when you change the release reference to a release of another product, the feature ID should get a new ID, based on the new product it is attached to. Otherwise, it is confusing when looking at a release or any report/view for people who are across multiple products - features from 1 product seem to belong to the wrong product.
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Thanks for the note. We can understand potential confusion when looking strictly at the Feature ID but this is done for good reason.
If the Feature ID were to be changed, this would break any existing links to the feature (from emails, integrations, etc.). In order to keep all links working properly and to ensure traceability, the Feature ID will need to remain the same.