Got the same issue (Mac, Big Sur, v.11.1., Evernote v.10.7.6 Premium)
No search working anymore. Just recognized.
Cannot find any to-dos from the last days that haven't been done, yet.
The search for
reminderOrder:* -reminderDoneTime:* -reminderTime:day+1
doesn't work, too.
No way to work now anymore.
Hope you guys provide an updates as soon as possible!!! to fix it.
Best regards,
Martin 🙂