If you have Exploding Arrow on left click and Immolation Arrow on right click, and you alternately left click and right click, you’ll (randomly?) perform no attack and will continue not attacking even with the mouse button down. Not sure what the exact trigger is but I can reliably trigger this when I open with right click Immolation arrow and alternate button presses in sync with my bow speed until I get to my 2nd Exploding Arrow use.
It’s easy to reproduce and is going to make immolation arrow unplayable. I can get myself so that I have either the right or left button down and not be attacking so the lockout isn’t specifically locking out either ability, but there’s something with immolation arrow’s animation or lockout timer that’s shutting out attacking depending on when you click.