Google app crashes without on-demand restriction

[T-vK]

I've been trying to get Google voice recognition to work offline properly.
After hours of trial and error I've come to the conclusion that it only works if I leave at least one of these permissions on-demand: View.getUserAgentString, View.setUserAgentString, View.initUserAgentString. It doesn't matter if I allow or deny these permissions in the prompt. But when I deny or allow them permanently, the Google app will crash the next time I give it a voice command.

I find that behavior very odd and can't really explain it. Any ideas what could be causing this and how I could work around this issue?