At least since 2017 the inverters have been pass-through so the inverter-supplied outlets work with shore power OR inverter power. On my '17 26U, the 2 plugs below the dinette, the one at the TV and the hidden one up in the DVD player cabinet are all inverter-supplied, as is the one by the bedroom TV in the back.
Zero Gravitas — 2017 Flying Cloud 26U | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill