430 SM at 4X MIMO-B?

Unfortunately we still have a few 430 SMs out there (on 450i APs).  I have discovered several that keep ending up at 3X/4X MIMO-B according https://trackeasy.fun/usps/ to the downlink https://showbox.tools/ status at the AP.  When this happens http://essaywriter.fun/ the SM reports low SNR and the link works badly.  Customers report problems like rebuffering.

Shouldn't this be impossible?  430 SM should only be 1X, 2X or 3X MIMO-A.

Is this a known issue with some AP or SM firmware version or something?  We still have the 430 SMs on 13.4.1.

Don't click links!  Should be sorta obvious but this is a spammer copy/pasting another users question and inserting spam links!  Reported to moderators!