Sentry API endpoint for querying issues has suddenly stopped accepting multiple "query" values

Referring to this endpoint:

Works:
curl -L -X GET ‘https://sentry.io/api/0/projects/cargurus/site/issues/?query=is:unassigned&statsPeriod=14d’ -H 'Authorization: Bearer …"

Does not work (worked as recently as 2021/02/08 11:45 AM EST):
curl -L -X GET ‘https://sentry.io/api/0/projects/cargurus/site/issues/?query=is:unassigned%20is:unresolved%20level:error&statsPeriod=14d’ -H 'Authorization: Bearer …"

In the second case, an empty array is returned from the API. When I run the same query in the Sentry browser interface, I see 1000+ issues.

Can you please investigate what is causing the issue in the API.

Thank you