Protector's Strike on-block effect different cooldown than the skill itself

[Kaatora.3186]

Normally, Protector's Strike is a channel skill that ends on the first block it does, then does its on-block effect. However, the on-block effect seems to have a different cooldown than the channeling part of the skill. So under certain conditions, the skill will do its on-block effect only half the time whilst channeling. The other half it will just block all incoming attacks during its full channel and never proc the on-block effect. Effectively, the skill as a whole is only doing what it is supposed to half the time under those certain conditions.

Conditions under which I have observed this: in WvW using the skill on-cooldown (blocking incoming attacks each time) while having the trait Invigorated Bulwark, which reduces the Protector's Strike cooldown. Not sure if alacrity affects the bug by making it worse, but the bug is more readily apparent with alacrity and while using the skill to block incoming attacks on-cooldown. I have not tested it under other conditions, such as without the trait or in other game modes.