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according to this wikipedia page, the opus number should be M.60 for the piano 4-hand, and M.60a for the orchestrated suite. the work page for it currrently has M.77 which is wrong.

this wikipedia page: https://en.wikipedia.org/wiki/List_of_c ... rice_Ravel
the work page for it: https://imslp.org/wiki/Ma_m%C3%A8re_l%2 ... ,_Maurice))

I wouldn't necessarily trust that Wikipedia list. IIRC its current form was done by someone who tended to just make their own info. The list on here is likely more accurate:
https://imslp.org/wiki/List_of_works_by_Maurice_Ravel

That said, yeah it's wrong, and Ma Mere L'Oye should for sure be 60....though probably not 60a because again, person who made stuff up.