CWDT not working with some spells and increased duration support

I tested with multiple skills in the video. It worked with molten shell and desecrate until i added increased duration. And as you can see it's not working at all with some other skills. Ofcourse they all have matching gem lvls, i showed it many times in the video. I tried relogging, different locations, still the same.

https://www.youtube.com/watch?v=9M9Uiop3AOM

When you have 30 unreserved mana, increasing the mana cost of a triggered skill from 27 to 35 will make it not activate, because you can no longer afford the mana cost.

true, thanks