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Leshaches
https://si.shimano.com/en/pdfs/dm/GAFD001/DM-GAFD001-01-ENG.pdf
"Installing the support plate
If installing the front derailleur to a brazed-on type frame, a support plate must be attached tothe seat tube.
Be sure to install this in order to prevent damage to the frame from the pressure of the front
derailleur support screw.
"
(I just googled "shimano grx front tab" and looked for a suitable result.)