Hi,
I've reported this bug several times in-game over the past year or so, and nothing has been done to address it.
Sometimes, on Herald, when you press F2 without Facet of Nature active, the game seems to register the key press twice, immediately activating the True Nature skill right after activating Facet of Nature. This is instead of just making True Nature available for activation and pulsing its passive effect as it should.
Here is a video.
There are 3 casts of Facet of Nature/True nature. The first and third (0:07 and 0:18, and 1:23) work correctly, the second (at 1:01) shows the bug.
This happens to me often during strike challenge modes (though it happens in all parts of the game), leading to a loss of quickness uptime (often pulsing no quickness at all at the start of the encounter because I lose out on the energy upkeep cost for true nature to activate Elevated Compassion, messing up my entire subsquad's actions for the first 5-10 seconds) and less boon extension & upkeep cost than I should get with the key presses I'm doing. It messes with my management of energy to pulse quickness in general, on all forms of quickness herald, since I'm sometimes counting on 2 pips of energy degen from it, and instead it blows true nature immediately and I'm now down one facet to get to the upkeep threshold for Elevated Compassion.
Herald at its core has 2 grandmaster traits centering entirely around upkeep management, while this essential upkeep skill has been bugged like this for over a year. It's a crucial problem for the specialization. Please take this seriously and fix it.