The good news is that it is probable OP will get to keep the erroneous 10 year GC until I-751 and/or N-400 are adjudicated.
Buckle up for the ride …
if I-90 is filed now; the probability of USCIS
* sending an RFE for the 10 year GC before I-751 is filed, or
* sending an RFE for the 10 year GC with a deadline before I-751 is filed
are, IMO, below 5 percent.
Regardless, every LPR is entitled to proof of status at all times, and I would refuse to comply with an RFE for the 10 year GC until USCIS granted my request for an ADIT.
And IMO the odds of USCIS delivering an ADIT between now and the 2 year anniversary of OP’s GC are under 1 percent:
Sure USCIS talks a good game with its mail in ADIT process, but in fact USCIS is back to its dirty tricks denying LPRs their I-551s. Making it all but possible to get USCIS to answer the phone makes the mail in ADIT process a nothing burger.
And once I-751 is filed,
* IMO pending I-90s are canceled, with prejudice
* USCIS says I-90 cannot be filed.
By all means, play the I-90 game. But OP will win the game because USCIS won’t even show up to play.
The wild card here is if OP travels internationally after I-751 is filed, and presents the extension letter with GC (as OP should, to avoid an I-193 fee) CBP might take the 10 year GC and replace it with an ADIT. This is a good outcome.