Hello,
That is most disconcerting. Since you aren't able to replicate it reliably, do you know in what situations (specific TI, specific ninja exam, etc) the bug is occurring? I suspect this is most likely the same persistent bug that plagues ETR Madara's mystery. If possible, when you next encounter this bug, can you try to get a hylogfile for me by typing in hylogfile anywhere in the game screen? If successful you should get a prompt to save a file to your computer. If you can send me that file here or through discord that would be appreciated.
Thank you and have a great day!

OK, that's definitely the same bug as ETR, then. I'll report this for you, but unfortunately the workaround at the moment is "don't use that ninja". Fortunately TI is easy enough that this shouldn't be an issue.

If you can get me that hylogfile that will help (it may nor may not work depending on how badly the game is frozen when you try).