Maybe you overlooked my previous comment from 2 days ago?I was surprised to see the level of charge adjustment still goes up to 100% after the fix. I'm guessing 100% on screen is 90% internal.
The recall update resets all of the charging settings, location, 8A vs 12A, and Hilltop Reserve\Target Charge Level. You state you reset location and 12A, but haven't mentioned the third factor which directly relates to your original question.
So, did you go back and reset the HTR or TCL?
BTW, the Bolt knows when it is charging on 240V, regardless of what EVSE you are using. It gets current on both of the pins on the J plug instead of just one. The L1 and L2 distinction is a general reference, but it is safe to say when power is delivered on Line 1 only, it is Level 1. If power is delivered on Line 1 and Line 2, it is 240V or Level 2.
When it senses 240V, it ignores the 8A vs 12A setting and takes everything the EVSE offers it which is always 12A in the case of the OEM supplied cord. Only when current is active on the one pin will it check the 8\12A setting and respond back to the cord to supply only 8A if the 12A toggle is not set, out of an abundance of caution.
I get the sense that two days later you are still not understanding why the long estimate to complete charging, is it because the estimate was anticipating charging all the way to 100% instead of your assumption it would be the 90% target you were accustomed to? Remember, the intermediate SW update put a 90% limit on all charging (and removed HTR\TCL). The "Final" update removed the 90% limit, allowing 100% charging again and restoring HTR\TCL settings. Of course, the default would be 100% because how would GM know your intentions?