Stitches Patchwork Creation and Biotic Granade

If Stitches take this lvl 1 talent - Patchwork Creation - he gain regeneration effects and all healing received by 15%. From 100% to 115%.

But, Ana’s grenade reduces all incoming healing by 100% without exception. While Stitch has a reduction of only 85% healing with this talent. This is a huge mistake.

Working as intended. The Biotic grenade says that enemies receive “100% less healing” that means it stacks additively with other healing modifiers.

If it reduced healing to 0% without exception, the tooltip would say “negate all healing” like “Force of Will” tooltip says about the damage.

This behavior is consistent as-written. My only concern would be if this is a recent development and it behaves differently than in previous patches without a corresponding patch note. Also worth investigating if the +25% healing from Ana on her teammates behaves the same way (if it’s inconsistent, that would suggest this is unintentional).