Issue with international characters in filenames

Hello,
I have RPi3 LMS 7.9.2 installation. Music library located on a NAS. Music folders mounted via fstab.
1. Issue is with international characters in filename in music library folder.
This is music folder that I see in Raspberian: '/mnt/music/_Зарубежная'
This is music folder, that I'm add in LMS after click 'Aapply' button: '/mnt/music/_Зарубежная'
2. If Music folder contains music files or folders with non-english characters in names (maybe inner tags?) Rescan Media Library doesn't work. After several files the scan process freezes. At the same time one of processor cores shows 100% load. Scanner log and Server log shows no errors. Abort scan doesn't work. The only way is to kill proccess.
3. Material skin plugin freezes LMS while trying to access files with non-english characters via "Music folder". Classical Web UI work properly with non-english "Music folder" - no freeze of LMS.

I tried new installation of RPi3 and LMS 7.9.2 and 7.9.1 with Audio Scan 1.02 and 0.95. But no success.
Maybe any prefs may force LMS to decode filenames correctly?