Spark Projectile Bug (Not visual )

When we play as a party using a spark carry, the carry's spark projectiles do not fire for a small amount of time. This is not a visual bug. The projectiles fired normally yet is sooo much reduced when someone uses a skill or encountering with mobs and them skill effects (mostly large packs) , bosses , maps with delirium also great example ( because of there are much more visual effect then normal maps ).

Long story short based on our experience anything with skill related makes spark projectile disappears. And its %100 is not just visual bug. The bug effects damage also.

And this is the video while we testing

https://www.youtube.com/watch?v=WY_96YzYb2o

Thank you very much for your attention.

Having the same issue sometimes when im solo doing maps
spark stops casting, idk what that is.