I registered this defect over a month ago and have not gotten any support on the issue.
https://www.ubisoft.com/en-us/help/cases/16720520
Skill expertise/grade on my MAIN (Normal mode) characters was deleted when skills were unlocked on a new Hardcore character.
- Main character had multiple skills (firewall shield, reviver hive, assault turret upgraded to level 20
- Started a new Hardcore character and ran through the Coastal tutorial and got to the BOO. Upon unlocking first skill (Assault Turret) ALL upgrades were deleted and skill was set to simply "Proficient" on ALL characters (all play modes)
- Second skill unlocked (Striker Drone) into second skill slot did NOT get wiped, but following skill (reviver hive) WAS wiped.
Others that I have been playing with are experiencing the same destructive issue. I am out AT LEAST 165 exotic components and unable to run new Hardcode characters through the story using meaningful skills, as it means losing them on my softcore accounts.
Wiped Skill
Proof that my skills are (were) upgraded to 20 prior to this issue