Selecting already open manifest in collection loads first manifest

[LlGC-jop]

UV version:

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Current behavior:

Selecting an already loaded issue from a collection via the date tree view reverts the viewer to the first page of the first entry in the collection.

Expected behavior:

Page 1 of the selected issue should be shown.

Steps to reproduce:

1. Load this manifest: https://damsssl.llgc.org.uk/iiif/2.0/1226390/manifest.json
2. In the left panel select the 'Index' tab and then group by date
3. Select any entry after the first one e.g. 01 April 1911
4. After it's loaded, re-group by date, and re-select the same issue
5. You should see page 1 of the first issue instead of the one selected

The same appears to happen if the issue if selected via the volume grouping and then re-selected via date grouping. (https://wellcomelibrary.org/iiif/collection/b19974760)

Related code:

// insert any relevant code here

Other information:

While this isn't a major issue, as it's unlikely a user would re-select something they've already selected, it's unexpected and a user might have forgotten which one they're currently viewing.