Aren't these designed to snap off? Is there a shot of the inside of the dropout? There should be a screw or two which holds the rest of the RD hanger onto the frame.
https://www.sigmasports.com/item/Trek/Madone-Domane-Derailleur-Hanger/1V6N
@PhilDAS started
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Aren't these designed to snap off? Is there a shot of the inside of the dropout? There should be a screw or two which holds the rest of the RD hanger onto the frame.