[7.0.1.beta3] Cannot add entry to collection from reader's item pane

Hi,
I've noticed a problem with the item pane in the reader tab.To reproduce:

1.188BET靠谱吗Close Zotero with a reader tab opened and start it again.
2.In the reader tab, click the plus button next to "Collections and Libraries" to add the item to a collection.
Result: All collections that do not contain another collection are greyed out.This makes it impossible to add the item to a collection.

Workaround: Go to the library tab, select any item, switch back to the reader tab.It's now possible to add the item to a collection.
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