New submission page is broken

When submitting a solution via

https://lean-eval-submission-server.lean-eval.workers.dev/

Pressing on [Submit exact commit] results in:

{
  "error": "provider_unavailable"
}
Document.querySelector: '#' is not a valid selector

The same workflow, with exactly the same fields (except for problem name) worked yesterday.

The exact query to https://lean-eval-submission-server.lean-eval.workers.dev/api/v1/browser/submissions that is being sent from the website (from network page) that results in the error:

{
	"submission": {
		"declared_model": "NEAR AI w/ DeepSeek V4",
		"problem_id": "annals_linear_subspaces",
		"production_metadata": {},
		"publication_choice": "scheduled",
		"schema_version": 2,
		"source_commit": "03e1aecee05cd9a14e7b97140dd96e3f3a826466",
		"source_repository": "SkidanovAlex/leaneval-deepseek",
		"terms_accepted": true,
		"terms_version": "lean-eval-intake-terms-v1"
	}
}

And the response is:

{"error": "provider_unavailable"}

Open the submission page at https://lean-eval-submission-server.lean-eval.workers.dev/ and reproduce the failure by pressing Submit exact commit. Inspect the request to /api/v1/browser/submissions and the accompanying Document.querySelector error. Done means the same submission workflow completes without provider_unavailable or selector errors.