Regression: FGameplayTag and FGameplayTagContainer pin value modification is not undo/redoable

For nodes with an FGameplayTag or FGameplayTagContainer pin, when changing the tag value (Pin->DefaultValue) and triggering Undo/Redo, the pin modification is not undone. Rather, it undoes the previous action. This is a regression: in UE 5.2.1 tag undo worked correctly.

In UE 5.3.2:

• Open a blueprint graph
• Create a node with a gameplay tag pin, for example Make Literal Gameplay Tag
• Set the tag value to anything other than None
• Press Ctrl + Z to undo
• Observe: The action undoes the node creation, rather than the tag value modification
• Expected: It should just undo the tag value modification

Alternatively:

• Add the Make Literal Gameplay Tag node
• Do another action, like deleting a BeginPlay node
• Change the gameplay tag value
• Press Ctrl + Z
• Observe: it undoes the BeginPlay node deletion
• Expected: it should undo the tag value modification

The same repro steps apply for FGameplayTagContainer, for example Make Literal Gameplay Tag Container.