Unable to shadow dash against Junghado dummy in situations I can normally shadow dash him?

[NueHoujuu]

This bug happens on the dummy, but not the real guy. After a tab switch I can, but other some scenarios I can't. I'm not sure what the exact scenario is, but it happens when I try to practice a certain PvP combo involving webbing the enemy, walking back, and stealthing.

 

It won't let me shadow dash to stealth on him, even if it's a failure.

 

Also small suggestion, but an infinite hp version of the dummy would be cool for practicing all sorts of things, since it can be stunned.