Missing Crossguard stance

So not sure if this helps your issue but i had an issue where i unlocked the crossguard stance fought some enemies then iut of no where the stance and saber disappeared. I found a way to fix it but no guarantees. Just because this worked for me doesnt mean it will for you.

I went to the cargo landing deck, took the elevator down, picked up a echo i missed then zip lined across to the other meditation point. I spam fought the raider whos hiding around the corner after the droid for xp about 7 times... (spam fought as in killed him and rested then went back) lastly i used the meditation point to fast travel back to the superstructure and went to the work bench.

Boom eveything reset and i got the stance and saber back. Long story short you might just have to fast travel and fight enemies idk. Trying to help more than EA is.