Hi,
Just found this
https://www.reddit.com/r/DestinyTheGame/comments/uwzjir/overcharged_vortex_grenade_tic_damage_heavily/?utm_medium=android_app&utm_source=share
Tested myself in the same lost sector as the Reddit post and can confirm that vortex grenades do around 3 times less damage today than before the season of the haunted patch.
Edit: another test from a well known Destiny player that confirms the above information.
https://youtu.be/fAoFSWULg58
Voidwall grenades have the same issue with tic damage, 3x reduction compared to last season.
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-blam!-, this season is just bugged to hell. The Tower is currently a buggy mess, and now this. What else is there that got screwed up with the coding?