This is a known issue that is apparently being worked on. The system assumes that when you enter a W2 with no information except what is in box 12a then you are trying to include it in earned income for purposes of receiving the earned income credit.
You don't need to enter this W2 at all, as you know, but if you are going to enter it you should enter the amount in box 12a as 'Medicaid Waiver Payments Not Reported on a W2 or 1099'.
@ld082154
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