I have generated this diagnostic in my Lacerte:

Form 8962: Form 1095-A - Health Insurance Marketplace Statement, Part III - Household Information requires an entry for Monthly Premium in any period where there are entries for Monthly Second Lowest Cost Silver Plan (SLCSP) and/or Monthly Advance Payment of Premium Tax Credit.

This diagnostic is not e-file stopping and will allow you to e-file. It does present itself in the situation you have stated above. Let me see if there is anything else that I can see about it from the instructions.