Block Manager - Br0k3n?

If I have a few Unique HTML blocks in the Product Tabs section of a product and then add a new block to the all pages section of the block manager all the Unique HTML blocks get removed… Has anyone else come across this behaviour in 2.2.4?

Its driving me crazy - all my products have data in their Unique Fields and to loose them just to add - say a ‘My Account’ block to all pages is just plain ridiculous!