Scrollable dropdown does not highlight current selection

[kskaiser]

Describe the bug

In the submission form for dropdown lists the currently selected item is not highlighted correctly.

To Reproduce

Steps to reproduce the behavior:

1. Start submitting a publication entry. For instance, select a "Type" or "Language" from the dropdown menu.
2. Click again on the dropdown list: the highlighted item will always be the one after "Clear selection".

Expected behavior

After selecting an entry from the dropdown list and clicking again to open the list, the selected entry should be focused on and highlighted.

Related work

Link to any related tickets or PRs here.

[tdonohue]

I'm able to reproduce this on sandbox.dspace.org. It's odd behavior, but it's simple to reproduce:

1. Start a submission
2. Select a "Type" (e.g. "Book")
3. Open the "Type" field again, and "Animation" (the first option after "Clear selection") will appear highlighted. See screenshot below:

Unclear which versions of DSpace are impacted, but it seems like minimally 9.x and main (latest) are impacted. Older versions may also be impacted (requires further testing/verification). Needs a volunteer to investigate & find a solution.