"Create one new multiplex settings tab and add all files there" and muxing chapter files

I discovered this behavior just now, which I believe is a bug (considering there's "all files" in the name). If you drag and drop or add files with "add source files", while having "Create one new multiplex settings tab and add all files there" enabled, chapter file will only be added to "No destination file" tab, while all other files will be added to intended tab. If the setting is "Add all files to current multiplex settings", it works like it should.