Tyranid Campaign - Vangaurd Genestealer Cult does not reduce enemy troops. (+Vangaurd Text Bug)

The second step of the Vangaurd power "Genestealer Cult" is supposed to put the enemy ships at "light casualties", however this does not happen. Tested in multiple systems and difficulties with Februar patch.
Defence Platforms/Stations do however have 50% reduced health (tested before februar patch).
0_1549573031559_Genestaler.jpg
0_1549573042784_Troops.jpg

also the Vanguard Fleet has code text instead of actual values(before februar patch it actually displayed a value):
0_1549573222255_Text.jpg