good to hear you got it resolved. Same issue applies to premium. Likewise any adjustment that applies to Treasuries in Box 3 needs to be split out as that affects state taxes differently. You also can't specify adjustments by state for munis. I usually split up my brokerage 1099s between taxable box 1, taxable box 3, non-taxable-home-state and non taxable-other-states. One of the many reasons I don't bother with importing 1099s.
I don't know why TT has these limitations if you hold individual bonds rather than funds, that said I prefer to split 1099s instead of having more worksheet tables that are harder to troubleshoot, but you have to know to do it. Here's a recent post from @SteamTrain which also describes these issues
https://ttlc.intuit.com/community/taxes/discussion/re-accrued-interest-bug-2024/01/3530581#M1306049
