Hello,
I will inquire as to this ninja and the bug. Can you please provide me a video showcasing the mystery failing to work as intended?
Thanks!

OK, we checked on the ninja and can't find anything wrong. He seems to be working as intended. To move forward with this investigation I'll need a video from you demonstrating the bug. Please let me know when you can, thanks!

sadly i cant provide a video. this bug took place inside theme arena. i used Black Zetsu's mystery against Naruto 6 path. neither he got immobiled and the healing from his water main was good. in my team i had Kakakshi kimono also. Kakashi didnt follow the immobile from Black Zetsu also.

SSP naruto is immune so wouldn't be affected by guaranteed immobile. The guarantee does not bypass immunity, it only means there's no chance of control fail. As for the healing, again, we checked this and tested and it's working fine on our end so we are unable to replicate your bug. We will need a recording of the bug if you want us to move forward on a bug report.