Likely working as intended, as explained here:
"Note that this star currently does not affect abilities that grant a Damage Shield as an auxiliary effect, such as Ferocious Leap or Shielded Assault, which is intentional as those abilities' primary functions are not to grant Damage Shields, therefore they are not considered "Damage Shield abilities"."
https://forums.elderscrollsonline.com/en/discussion/559360/pts-patch-notes-v6-3-0
Likely working as intended, as explained here:
"Note that this star currently does not affect abilities that grant a Damage Shield as an auxiliary effect, such as Ferocious Leap or Shielded Assault, which is intentional as those abilities' primary functions are not to grant Damage Shields, therefore they are not considered "Damage Shield abilities"."
https://forums.elderscrollsonline.com/en/discussion/559360/pts-patch-notes-v6-3-0
This must be explained in game not here. Change descriptiom in the game!