Hello DJ C,
Thank you for reaching out to Microsoft Q&A forum
No permanent fix has been announced for this issue yet. But there is workaround for you to use to search by tag:
Try this link https://photos.onedrive.com/explore/things/thing?id=testmytagsplease and replace "testmytagsplease" with your tag.
This as a temporary workaround to pull tagged pictures while the main search is not able to search tagged pictures.
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