Can't copy files in some programs unless history is empty (VSCode, VirtualBox...)

Recently noticed that I couldn't copy files on Visual Studio Code since I upgraded xfce4-clipman-plugin to 1.6.4.

After a bisect I found that this behavior is produced by this commit: eab4beac

How to reproduce on VSCode:

• Install Visual Studio Code or VSCodium / Code - OSS
• Open a folder on VSCode. Files are shown on built-in file fxplorer.
• Clear clipman history.
• Copy and paste any file in VSCode file explorer. It should work.
• Now copy some text.
• Copy and paste any file in VSCode file explorer. It won't work.

Same happens when copying files on VirtualBox guests (when clipboard sharing is enabled), so I guess that there are more programs affected.