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@TheBrick(Tommy)
I can't see because the gif keeps changing but is the actual lug broken or is the seat tube just come out of the bb lug and the ring around it is just paint?
It's fixable either way.
I'd guess that the tube / lug was not preped / clean properly resulting in a weaker braze, hence more stress on a small area hence snap. I'm am no welder / brazer though, just a guess.