Rename a collection while it’s selected in a Search, and it doesn’t update the name of it in that search (though the search still works if you run it again).
To reproduce:
Do a search restricted to a collection.
Open Collections tab, open that collection, and rename it. Close Collections tab.
Return to search and notice that the Search form still shows the old name of the collection.
Search for something else without changing the collection you're searching in. It does find it, so it's got the right collection selected (by internal ID number, probably), but it still isn't displaying it correctly.
You have to close the Search tab and reopen it in order for the collection name to refresh.