Thank you for further cooperating on the matter.
The described issue really sounds like a bug, although even with the configuration provided it is not reproducible locally. Could you also verify if the OnClientCommandExecuted handler implements logic that might lead to this side effect? Also, you can try removing the ContentFilters property, so to reset it to its default collection.
If the problem is not from the logic implemented in the handler, then I suggest prompting the users for exact steps to reproduce, so that we could be able to debug the pasting functionality and locate the exact origin of the problem.
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