I use VLC, Kdenlive, Qbittorent etc and after the last update, I saw that texts, icons, labels etc became grey or transparent making them unrecognizable. Using Kvantum some of the software themes can be fixed.
But WPS office was impossible to fix by using Kvantum.
I used the following settings.
After applying these tweaks the problem was no longer seen. But using any dark Kvantum theme is still difficult I guess.
Hoping that in future updates most theming problems will be solved.