I have noticed a strange behaviour which might or might not be bug.
Step away from armored dummy (stormvermin / clan rats) and start using first charged attack, if you miss, tap forward and repeat. When you get to maximum range for dagger, it will do 0 damage and do not apply dot. As shown in video, it also happens on targets that are next to you.
(When I tried that with flaming sword it applied dot, thats why I think it is not intended)
Everytime when done properly, this might also be connected to Flaming flail heavy attack bug. Both have to do with same icon in the mod and both do 0 damage to target.
.mkv video showing the issue (Warnig! a bit louder than I would expect and also sorry for recording with mic, which includes keyboard tapping )