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That's because VMware uses thumbnail previews. There's nothing to decombine, as there's actually only one taskbar item.
You can turn the feature off, see this answer.
I'm not familiar with QQ, perhaps it offers an option, too.
I'm not familiar with the issue, but I found the following thread for you:
http://www.tenforums.com/browsers-email/20589-cant-unpin-microsoft-edge-taskbar.html
Perhaps the issue was fixed in v5.2. If not, please leave a comment or create a new topic.
I assume that it's not an issue anymore.
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I could not reproduce the problem on my laptop, Windows 10. I'll try later on a different computer.
Meanwhile, can you attach a crash report? You can use the following guide:
How do I find event logs when a program crashes?