PDF reader: left click creates stuck drag/selection, then dragging stops working (macOS)

In the built-in PDF reader, a single left click draws a blue line on the text, and the reader stays in a drag/selection state that I cannot cancel. After pressing Esc, I can no longer drag or select text at all.

Happens with all PDFs (not just one file)
Mouse works normally in other apps
Still happens after restarting Zotero, in Troubleshooting Mode (all add-ons disabled), and after resetting prefs.js

Debug ID: D854242825
Zotero version: 10.0.9
macOS version: 26.3 (Mac mini)
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