I'm having an issue with Ryth in the new update. I lost to him as Siris, and now I cannot ever get the dual lightsabers from him, even if I rollback my rebirths and deathless levels. However, I beat Ryth as Isa on the very first try, and I managed to get the Darth Maul lightsaber from him.

I heard it's more or less related to a glitch that happened to Oslim, where failing to defeat him on the first try will deny that character the Infinity Swords (forever, I believe). However, I managed to kill Oslim before he had a chance to kill me, so I never experienced the Oslim glitch and I'm not sure if it can be resolved.