This is an issue of Youtube Data API.
Already reported this issue by someone on Google forum and below is reply from Google employee:
https://support.google.com/youtube/thread/2494861?msgid=2520468
YouTube is aware the search/sorting functions aren't working as
expected – this is temporary and part of our efforts to better
respond, review and remove graphic, violative content from YouTube.
Thanks for your patience while we work through this. Will update this
thread when these features are working normally again, feel free to
subscribe for updates.
Also, Bugs are reported for this on issue tracker:
https://issuetracker.google.com/issues/128673031
https://issuetracker.google.com/issues/128673552
Both issue have comment from Google employee as below:
Thank you all for bringing this up here. These specific filters have been currently disabled on both YouTube.com and through the APIs.
We should have updates on this soon. Thanks again.
Update on 27/3:
Now it's working normally again, as per threads.