Correct...BUT...
1) You need to see if the Treasury bond interest error still occurs if you have the box 3&12 values removed and reported in a separate 1099-INT from Vanguard...before you report the accrued interest paid to the seller in that same...separate.. 1099-INT Form. IF that error occurs in that situation, then one or more of the Treasury bonds must have matured after 2022. (though, I could possibly see a strange situation where premium paid (box 12) plus accrued interest reported, exceeds the box 3 value....I haven't researched what needs to be done in that situation, since I never buy a bond that matures in the same year.
2) Since you have purchased both treasury bonds, and a Muni bond in 20200, then sounds like you will need to take that one Vanguard 1099-INT, and put the box 3&12 $$ in a new 1099-INT form Vanguard, and then the box 8 & 13 values in another new 1099-INT from Vanguard.
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My brother avoids almost all these issues by only buying Bond Mutual Funds from Vanguard, where they deal with all that stuff internally, and only have to report net interest generated (which ends up on a 1099-DIV instead).
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
