Invocated Echoes notable doesn't provide any Energy refund (does nothing)

Arc always costs 22% energy to trigger with Spellslinger invocation, Invocated Echoes notable never triggers to provide 50% energy refund. The skill menu doesn't even display chance for refund.

Both Energise notable and Energy Retention support gem provide 35% and 25% chance for energy refund respectively and they are properly displayed in the skills panel, these work fine.

I found the same issue on Spellslinger. The half energy never triggered when I tested. The skill panel does not display the description about the half energy consumption either.