At first, I tried running Zotero.Prefs.set('purge.items', true) in JavaScript, but it didn’t execute successfully. Then, when I tried reopening Zotero, the issue still persisted.

If not, and you go to Tools → Developer → Run JavaScript and run the following command, does it happen again on the next startup?

(The reader doesn't run any page JavaScript, so this is probably a CSS issue, but we'll need to see the file to be sure.)

Substack does capture copy event with javascript for a pop-up to "Restack". Maybe the snapshot has preserved part of the javascript so it still captures the copy event but does not bubble the event up

[JavaScript Error: "HTTP GET https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=PubMed&tool=Zotero&retmode=xml&rettype=citation&id=40015819,39991680 failed with status code 0" {file: "chrome

After launching version 7.1-beta.17, I see a "'value' must be a string" error:

https://forums.zotero.org/discussion/121777/javascript-error-the-user-aborted-a-request-in-zotero-desktop-version-7-0-11-64-bit

When I try to set up WebDAV sync I see the error: [JavaScript Error: "The WebDAV server did not accept the username and password you entered. Please check your file sync settings or contact your WebDA

When viewing and annotating a PDF within the app, converting an underline to a highlight generates some kind of javascript error (report code:297722493). At this point the tool bar vanishes and the ri

[JavaScript Error: "[Notero] Starting v1.0.0"]

in months. Did you disable automatic updates? [JavaScript Error: "Zotero.Utilities.xpathText(...) is null" {file: "chrome://zotero/content/xpcom/style.js" line: 651}]

[JavaScript Error: "Missing property "translatorID" in translator metadata JSON object in undefined

[JavaScript Error: "Error 400 for item TSZFKR8F in Ma bibliothèque:

that import, and run this code in Tools → Run JavaScript to delete all the invalid creators:

[JavaScript Error: "uncaught exception: undefined"]

-> The toolbar has disappeared. [JavaScript Error: "annotation is undefined" {file: "resource://zotero/reader/reader.js" line: 25346}]

After selecting the snapshot, it shows the following error in the Debug Output: [JavaScript Error: "Failed to attach Declarative Shadow DOM."]

[JavaScript Error: "Download request 1/BD39ZKTB failed"]

[JavaScript Error: "Calling -setData:forType: on NSPasteboardItem with nil `data` for type dyn.ah62d4rv4gu8ycyc2mu. @[setText:field.m:395]" {file: "resource://zotero-macword-integration/messagingGener

[JavaScript Error: "HTTP POST https://api.zotero.org/users/16398750/fulltext failed with status code 400: