The actual copy functionality doesn't seem to be affected, but the "Source Field" and the "Template" of the dialog don't look quite right:

Error
An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
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Debug info:
Anki 23.10.1 (fac9e0ee) Python 3.9.15 Qt 6.6.0 PyQt 6.6.0
Platform: Windows-10-10.0.22621
Flags: frz=True ao=True sv=3
Add-ons, last update check: 2023-12-27 11:49:10
Add-ons possibly involved: Advanced Copy Fields
Caught exception:
Traceback (most recent call last):
File "C:\Users\...\AppData\Roaming\Anki2\addons21\1898445115\advanced_copy_fields.py", line 433, in onActionIndexChange
self.onCustom()
File "C:\Users\...\AppData\Roaming\Anki2\addons21\1898445115\advanced_copy_fields.py", line 419, in onCustom
cursor.movePosition(QtGui.QTextCursor.End)
AttributeError: type object 'QTextCursor' has no attribute 'End'
I get the error below when I do the following:
The actual copy functionality doesn't seem to be affected, but the "Source Field" and the "Template" of the dialog don't look quite right:
