Hello! Thanks for getting to me. I'm sorry to hear the self-voicing isn't working. Hm... My schedule is a bit packed at the moment related to Mizuchi, but I'll try to see if I can get this addressed. This is the main game? Which command did you use to try to activate voicing?
Hello again. After a bit more rummaging through. We realized that Mizuchi does not have an accessibility page (shift+a) or the clipboard feature as it did not exist yet in the engine when Mizuchi was created back in 2017. Self-voicing always existed hence it should still work for Mizuchi, but I was unable to get Shift+c to work. Clipboard voicing works in our newest game project, so we know it has something to do with the older version lacking that feature.
I sincerely apologize as this is not something I can easily fix at this time...