Glaive detonation is currently still bugged, this occurs however only with Garuda. Every single other frame tested now works correctly again, requiring 1 button press to detonate whilst Garuda still requires 2.
This can be recreated with ease and happens 100% of the time;
1) Equip Garuda (Only tried with prime)
2) Equip any one-handed pistol and Glaive Prime (Also had the same issue with Xoris, I imagine it's all Glaive weaponry)
3) Attempt to detonate the glaive of choice whilst dual-wielding both the pistol and glaive, it will require 2 presses 100% of the time to detonate it
Without dual-wielding however, it will only require the 1 press, this only occurs when dual-wielding and as far as I can tell, only on Garuda
(Potentially because of her pseudo exalted melee, as no other frames have this to cause them to have this issue still too.)