My TT had that for the microwave. In areas that only need one outlet (Microwave outlets are usually hidden in a cabinet, your TV outlet might just be inconvenient to plug anything else into.) they use those because frankly, they're cheaper especially in the bulk packs manufacturers buy.
You should be able to easily swap them for regular two outlet versions.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10