Critical bug - creating chapter using PGN not working

Hi,

I'm a very frequent user of 'creating chapter using PGN' feature and last time I used it successfully maybe less than 16 hours ago. But now, when I do it, it's not working.

When I checked the console, looks like there is some issue with following API call:
lichess.org/study/<study_id>/import-pgn?sri=<some_random_chars>

And the response is:
{"variant":["Invalid value: Automatic"],"error":{"variant":["Invalid value: Automatic"]}}

I think the function of creating a new chapter was damaged