Trimmed Duration in the Video tagset of the Metadata panel is blank until you delete <catalog>Helper.lrdata and restart LR (i.e. another caching bug). To reproduce on LR 14.1.1 / Mac OS 14.6.1:
1. Make a new catalog.
2. Import the attached video.
3. In Loupe, trim the video to one second long.
4. In the Metadata panel's Video tagset, observe that Trimmed Duration is blank:

5. Restart LR and observe Trimmed Duration is still blank.
6. Exit LR and in the catalog folder, delete <catalog>Helper.lrdata.
7. Restart LR and observe that Trimmed Duration now correctly shows the duration:
