WFC Kingdom Galvatron misassembled shoulders

[Skyfire]

Another way to tell could be the production code. The ones with a later production code should be more likely to have the correctly assembled shoulders. My copy of Kingdom Galvatron with correctly assembled shoulders has '11371' stamped on the back of the box near the 'SC' symbol. Presumably '11371' means 17 May 2021.

Mine is the same as yours.