Thicket Warding is not works

https://poe2db.tw/us/Thicket_Warding

Since I am Japanese, I’m using a translation tool. My sentences might sound a bit odd.

Thicket Warding is supposed to trigger when using a charm, but it seems to actually trigger when the charm's effect takes place.

Also, when a charm that triggers upon taking elemental damage is triggered again during its effect duration, it seems that mana recovery does not occur.