Querying a view yields "unknown error"

Both curl and the console face an issue when interrogating a view with a start key on my buckets (HTTP 1.0 or 1.1). When not using a start key, everything is fine.

Here is curl's trace:

curl -vv -g --http1.0 http://user:password@127.0.0.1:8092/mybucket/_design/myview/_view/v?stale=false\&startkey=\"\"\&endkey=1620094441\&limit=11

• Trying 127.0.0.1:8092...
• Connected to 127.0.0.1 (127.0.0.1) port 8092 (#0)
• Server auth using Basic with user 'user'
  > GET /mybucket/_design/myview/_view/v?stale=false&startkey=""&endkey=1620094441&limit=11 HTTP/1.0
  > Host: 127.0.0.1:8092
  > Authorization: Basic YnVja2V0dXNlcjp0aWxpc3NlIQ==
  > User-Agent: curl/7.75.0
  > Accept: /
  >
• Mark bundle as not supporting multiuse
• HTTP 1.0, assume close after body
  < HTTP/1.0 500 Internal Server Error
  < X-XSS-Protection: 1; mode=block
  < X-Permitted-Cross-Domain-Policies: none
  < X-Frame-Options: DENY
  < X-Content-Type-Options: nosniff
  < Server: MochiWeb/1.0 (Any of you quaids got a smint?)
  < Date: Wed, 05 May 2021 02:34:18 GMT
  < Content-Type: text/plain;charset=utf-8
  < Content-Length: 43
  < Cache-Control: must-revalidate
  < {"error":"unknown_error","reason":"undef"}
• Closing connection 0