Do you have any plugins installed? I don't think Zotero has any functionality to add metadata once a parent item exists (various plugins, e.g. Zotero linter, do).

I gave Claude my logs and the codebase to look into the issue. I'm not familiar with the code so I can't say if it's right, but as I'm still experiencing this issue I figured it might be helpful.

Claude:
=======

# Tag input focus loss bug during Connector save

## Symptom

When saving a document from Chrome's Zotero Connector, then switching to Zotero and typing a tag, the tag input loses focus mid-keystroke. The partially typed text gets saved as one tag, and the remaining keystrokes become a second tag (e.g., "foobar" → "foob" + "ar").

## Root cause

Two bugs compound:

### Bug 1: `attachmentBox.js` line 229-230

```javascript
if (this._item && val.id != this._item.id && document.activeElement.closest("editable-text")) {
document.activeElement.blur();
}
```

The `attachmentBox` item setter blurs `document.activeElement` whenever ANY editable-text in the entire document is focused — not just ones inside attachmentBox. The intent was to prevent stale title data from being saved when switching between attachments, but the check is document-global.

`this._item` is only updated when the assigned item is an attachment (line 232-233). For regular items, `this._item` retains whatever attachment was last viewed, making `val.id != this._item.id` always true when displaying a regular item.

### Bug 2: `itemDetails.js` line 419-426

```javascript
notify = async (action, type, ids, _extraData) => {
if (action == 'refresh' && this.item) {
// No check that ids includes this.item.id
await this.render();
}
};
```

The notify handler triggers a full `itemDetails.render()` for ANY `refresh/item` notification, regardless of which item was refreshed.

## Trigger chain

1. User saves a document from Chrome Connector. Zotero creates the parent item plus child attachments (PDFs, snapshots).
2. Several seconds later, fulltext indexing completes on a child attachment. This fires `refresh/item` for the attachment item.
3. `itemDetails.notify()` receives `refresh/item` for the attachment. It doesn't check whether the refreshed item matches the displayed item, so it calls `this.render()`.
4. `itemDetails.render()` iterates all panes and sets `box.item = item` on each, including attachmentBox.
5. `attachmentBox.item` setter fires. `this._item` is stale (the last attachment ever viewed). `val` is the current parent item. Since their IDs differ, and the tag input is a focused editable-text, it calls `document.activeElement.blur()`.
6. The tag input loses focus. The blur event triggers `saveTag()`, which saves the partial text as a tag, clears the input, and schedules a `setTimeout` to refocus it.
7. The refocused input captures the remaining keystrokes. The user presses Enter thinking they're confirming the full tag but actually confirms a fragment.

## Why mouse interaction matters

The bug requires `this._item` on attachmentBox to be non-null, which only happens after the user has previously viewed an attachment item (by clicking on one). After that, the stale reference persists for the lifetime of the pane.

## Debug evidence

Three occurrences captured via runtime logging. Each showed the same pattern:

```
NOTIFY refresh/item ids=34106 ← unrelated item (attachment being indexed)
NOTIFY activeElement=input#.input ← user is typing in tag input
Viewing item ← itemDetails.render() fires
Refreshing item box ← pane loop runs
Setting mode to 'edit' ← attachmentBox renders (blur already happened)
Stopping autocomplete search ← autocomplete torn down due to focus loss
Saving tag ← saveTag fires from blur
TAG FOCUSOUT: relatedTarget=null ← focus gone, nowhere specific
```

`relatedTarget` being null confirmed `.blur()` was called directly.

## Fixes

**Minimal fix** — scope the blur to attachmentBox's own elements (`attachmentBox.js:229`):
```javascript
if (this._item && val.id != this._item.id && this.contains(document.activeElement)) {
```

**Defense in depth** — don't re-render for unrelated items (`itemDetails.js:420`):
```javascript
if (action == 'refresh' && this.item && ids.includes(this.item.id)) {
```

## Key files

- `chrome/content/zotero/elements/attachmentBox.js` — item setter with document-global blur
- `chrome/content/zotero/elements/itemDetails.js` — notify handler lacking item ID filter
- `chrome/content/zotero/elements/tagsBox.js` — saveTag triggered by blur
- `chrome/content/zotero/xpcom/notifier.js` — notification dispatch system