I don't see that this is anything that American Express can "fix", in the sense that they cannot force each location to use a merchant account with a name that matches the restaurant. Is there a store number, or similar, in the transaction description?
It appears there is a store number in the charge.
The charge appears like this: UNCLE JULIOS 044 044COLORADO SPRI CO
Previous to June 2025, the charge appeared as follows: "HACIENDA COLORADO SPCOLORADO SPRI CO" and the Resy credit always triggered automatically.