problem with working cuelists merging

I get a strange bug sometimes. When I megre some information to working cue from working cuelist and make it several times, i can get situation when my changes isn't properly saved to a cue.
So i make merging - press clear, and my information dissapear, But when i open cue in editor - its OK again. So i can see my changes only opened in editor.

Sorry for bad english)
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