Blueprint functions get renamed after compile

Development Programming & Scripting Blueprint
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1

I have been using blueprints extensively in my project and have a LOT.
I made a change in my player character to set visibility on a UMG widget, and when i compiled the blueprint, the functions in the umg widget were all renamed with a _0 at the end.

Seems like a compilation bug?

2

Reloading the editor and renaming the functions back fixed it, makes me a bit nervous though!