A problem was fixed in 7.0.0-beta.80+9de70613a
see e.g https://forums.zotero.org/discussion/114451/zotero-7-beta-jumping-focus-to-the-title-when-editing-fields-in-the-item-pane

It had to do with tabbing between fields in the Item Pane. This was fixed, thanks!

But now (in beta-80) I experience other and more severe problems there:

1) In many cases I cannot type in values in fields at all, the typed character just blinks but does not stick

2) Especially if I e.g. try to add a new name for Author, i.e. click the plus sign for the Author above, which adds new empty fields below. I fill out (last) name = ok. Tabbing to (first) name field now works. But it displays the behaviour in point (1) = nothing can be written there

3) clicking - sign to remove the newly half-created Author does nothing, not working

4) Once the phenomenon has started it affects other fields in the Item pane. I cannot write anything.

macOS 13.6.7 Zotero 7.0.0-beta.80+9de70613a