Playback Volume setting reset after reboot

If I change the playback volume via Video OSD and mark as “Set as default for all media” this works fine and holds for all media, until I reboot and this is reset to 0.0 dB.

I’ve tried in Kodi for Windows & the setting is held so it looks like it could be a bug in CoreELEC (using Matrix 19.1 rc4).

This is the setting I’m referring to:

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