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I could repair the media files which caused the issue with the MP3val tool:

[ATTACH=full]204829[/ATTACH]

Now the files are played without issues, even when the Gapless Playback option is enabled.

But independent from the corrupt file issue I just found out that the forward function also causes the "GCHandle of Musicstream not found in Dictionary" error with healthy MP3 files, when the track is forwarded for less then 20 seconds to the end. But this is a minor error. It doesn't happen with FLAC files.