Definitely since the hotfix, probably since the patch, disarm traps doesn't seem to be working correctly. I'm at the chest in a cave system adjacent to the Druid Grove, with the big chest and all the oil. Astarion has successfully unlocked the chest and then made a successful perception check. He has five disarm tools on his person, yet I am getting no option to disarm the chest so as to open it without exploding in a fiery death.
I'm uncertain if the option came up before the hotfix, since none of the traps in the crypt are disarmable in that way.