Here are some of our findings:
Changing areas AND getting skill point sometimes causes these two skills to be totally unusable, of course I’m using it on a target but the skill won’t even indicate it’s being pressed (the icon shown being pushed down and dimming). At first I thought it was because I took “Art of Spear”, “Deadly Stab” and “Pilum Assault” node from the Lunge tree and thought it only change to be only usable with a spear weapon equipped, until I tried to use Smite manually too.
Gaining a skill point even for other specialized skills and not just Lunge itself sometimes make it unusable too even I was able to use Lunge just few moments before. Also it wasn’t just me, it also happens to my brother I was playing with in the same region, same house with only around 30-80ms latency. So I thought I’d mention these that might help with investigating the issue.