zotero:// URLs open new instance of Zotero

When I follow a link of the form zotero://open-pdf/library/items/ or zotero://select/items/, another instance of Zotero opens and then presents me with a modal that says "A copy of Zotero is already open. Only one copy of Zotero can be open at a time."

Following links used to work perfectly--Zotero would come to the forefront with the item selected or whatever.

I'm using Zotero 6.0.30 on macOS 13.6.2.
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