Reduced effect of curses does not work when allocated to a specific weapon set

How to reproduce:

Allocate 2x Curse Effect on Self & Warding Fetish to a specific weapon set (having focus is not mandatory, but makes sense due to Warding Fetish interactions).

This combined with Craiceann's Rune of Warding body rune should reduce the effect of curses to 110% (100% effectively, negating any curse effects).

The observed result:

Curse effects get reduced by 50%, even though focus is equipped and correct weapon set is active. Only the body rune works, the passive tree effects are ignored. The only way I managed to reduce curses by 100% was to allocate the nodes the regular way, and not to a specific weapon set.