A Massachusetts resident working remotely for a company in Connecticut does not have any Connecticut income. If you have no CT withholding, you can delete the CT line in your W-2.
If you have no CT withholding, removing those boxes will not have any impact on your federal or Massachusetts tax.
Connecticut says:
Connecticut sourced income of a nonresident is income derived from or connected with sources within Connecticut when the income is (among others):
Attributable to compensation for services performed in Connecticut or income from a business, trade, profession, or occupation carried on in Connecticut. This includes income derived directly or indirectly by athletes, entertainers, or performing artists from closed-circuit and cable television transmissions of irregularly scheduled events if such transmissions are received or exhibited within Connecticut;
See Connecticut Sourced Income of a Nonresident – Nexus.
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