Can't copy from Zotero Group into local Zotero (Standalone) Library[ID: 1189596731]

Using the new standalone (3.0b1) every time I try to copy (by dragging) an entry from a Zotero Group Library into a folder in My Library, it fails and tells me to restart (tried several times).

Also, I tried to do this back in Firefox but the same error now occurs.
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