The Biochemist DOff does not and has never granted a -10 damage resistance debuff to most (or any) science kit debuffs. The powers correctly display this debuff, however, they are NOT applied to the target the power is cast on. I repeat: the display is correct, but the effect does NOT exist.
I would appreciate some acknowledgement that Cryptic is at least aware that this bug exists, even if you have no intention of ever fixing it.
I noticed while testing on Tribble that my biochemist debuff was appearing on the active effects indicators under target portraits, now. So I did a bit of testing with another player.
Biochemists still do not actually apply any debuff to the target. They correctly display the debuff to sci debuff powers, and the debuff correctly displays under the active effects indicator on the target's portrait. However, the target's damage resistance is still NOT reduced.
(Note that this is technically a Tribble bug report, but since it is directly pertinent to what appears to be a fix to this bug, I think it belongs here.)
You have now been 'looking into this' for a month and a half. I described the means of reproduction clearly. The bug remains present. I would appreciate acknowledgement that the bug exists, even if no solution is forthcoming.