The Spellsword, sorcerer background does not seem to be adding the two weapon proficiency feats as stated at level 1. The attack bonus still seems to be implemented though.
This seems to be the case for newly created characters at least.
I tried this on a few characters. I took the background at level 2 and at level 1 with another character, then relogged to see if these feats would be applied. All efforts yield the same result: the feats remain missing.
Tried entering a new area? If there's one thing that's been consistent in all my testing, it's the proficiencies being added. Just be careful about blackout for now, because you may lose your proficiency weapon due to a bug.
Exited the OOC Starting Area, and it seems to have done the trick as advised. The feats are all applied now.
Resting seems to be a good fix when things aren't applying.
There is an option to reapply the bonuses as well under the class perk menu. This only works if you have no other effect active on yourself.