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After hovering over a child keyword in the Keyword List and clicking the right-arrow, the Keyword column in the Library Filter bar's Metadata browser sometimes shows a wrong keyword as selected. To reproduce:
1. Reset LR's preferences.
2. Make a new catalog.
3. Import three photos.
4. Using the Keywording panel with Keyword Tags: Enter Keywords, assign the first photo the keyword AAA, the second photo the keyword AAA > BBB, the third photo the keyword CCC.
5. In the Keyword List panel, hover over AAA and click the right-arrow to filter by AAA. The first and second photos are correctly displayed (with keywords AAA and AAA > BBB).
6. In the Keyword List panel, hover over BBB and click the right-arrow. The second photo is correctly displayed, but the Keyword column in the Metadata browser shows CCC as selected, rather than BBB: