Cannot search inside specific folders using Finder on Mac

After upgrading Dropbox on Mac to the latest version (v164.4.4300), I am no longer able to use Finder to search within specific Dropbox folders for content inside the files (pdfs, text documents, etc). Previously, I could use the normal search function in a Finder window to do keyword searched across the content of all files within a given folder. But now, whenever I limit the search to a single folder, nothing shows up at all in a search.

Note the following:

— All files and folders in question are fully synced and available offline, not stored only online

— Strangely, files containing the keyword DO show up when I don't limit the search to a specific folder; but when do limit the search to the folder that contains those files, they no longer appear in the finder search results.

Please let me know what other information might be useful to resolve this. This bug makes Dropbox unusable for some of the key purposes I rely on it for, and if I'm not able to resolve it quickly I'll have to transition entirely to a different service (eg iCloud). Thank you!