I suspect the inverted flare "port" was damaged and the "rebuilder" bored it out and installed the (incorrect) adapter.
A couple of years ago I installed a "rebuilt" booster and it had a similar adapter that fit the brake line but wouldn't seal to the booster itself, a close look revealed a botched threading job.
Had to return the booster for another which was OK.
Suggest you try again, as well.
The other possibility is that the rebuilder didn't have a "core" for your type of booster and used a core that was originally made to accept a "banjo fitting" at that port and made a failed attempt to adapt it to build the part number unit you require.
Either way, they failed to provide you with a functional replacement for your specific application.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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