The description for the skill now says enemies receive “2 times more anomaly damage for 5 seconds.”
It previously used to read “1.5 times more anomaly damage.”
I didn’t—and still don’t—see this in the patch notes.External link →
I've checked this with the team today.
The value this mod provided was apparently always set to 2 in code-calculations, but it was displaying incorrectly as 1.5 in the tooltip. The latest patch fixed the tooltip description to correctly display the actual damage multiplier.
In terms of why it might not have been included in the overt patch notes - it might be considered a "minor" bug as it did not change any values or make players stronger or weaker, so would have been under the "minor bugs" umbrella.