.M4A not saving or showing Metadata properly

This has been reported a few times but still doesn't seem to be working correctly. When viewing or updating data on a .m4a file's metadata it doesn't save updates or display the data saved in VLC.

When I open the metadata dialog he file doesn't show what was saved using VLC tools. OK no problem I'll fill it in directly through DO and ok. It wasn't refreshing onto my lister so I hit refresh a couple times but nothing. I went back into DO metadata dialog and everything but the Star rating was gone. I retyped it again just for grins and giggles and OK and still it is lost.

Here's the dialog from VLC tools. It hasn't changed since I added the metadata initially.

This is the 2nd dialog showing only the star rating.

This is the 3rd dialog showing the fields about to be updated.

And then we're back to the exact same as the 2nd diaglog.

Please send us a couple of example files that have the problem.

Also check if any other tools or the Properties dialogs behave like Opus or VLC, in case VLC is doing something unusual rather than vice versa.

I did it in reverse order today and I think DO is writing the info it's just not displaying it.

I've zipped up 3 songs and I've included the DO metadata dialog initial and after update for the 2 new songs, the first file is up above, then the VLC tool display. I also included the File Group info for Music which I guess implies that any tag data would be read from the mp3 tags to the Info Tip regardless of their extension or container? In other words a .m4a file is still getting it's data from mp3 tags? I don't have an understanding of how this is done for the various different containers.

mp4.zip (21.7 MB)

So this is a bit odd. It seemed to display fields that it didn't on the other 2 files.

Here's the info Tip display but I don't see any data in any of the 3 files.