Can't create ACME cert from CSR

Cert renewal is still broken (with the same error as below), so I tried to start over.

Created a new CSR with my host name in Common Name, tried to create an ACME cert from it using Route53:

Error: Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/middlewared/job.py", line 349, in run
    await self.future
  File "/usr/local/lib/python3.7/site-packages/middlewared/job.py", line 385, in __run_body
    rv = await self.method(*([self] + args))
  File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 961, in nf
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/crypto.py", line 1279, in do_create
    job, data
  File "/usr/local/lib/python3.7/site-packages/middlewared/utils/run_in_thread.py", line 10, in run_in_thread
    return await self.loop.run_in_executor(self.run_in_thread_executor, functools.partial(method, *args, **kwargs))
  File "/usr/local/lib/python3.7/site-packages/middlewared/utils/io_thread_pool_executor.py", line 25, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 965, in nf
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/crypto.py", line 1325, in __create_acme_certificate
    final_order = self.acme_issue_certificate(job, 25, data, csr_data)
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/crypto.py", line 956, in acme_issue_certificate
    normalised_san = ':'.join(self.middleware.call_sync('cryptokey.normalize_san', [domain]))
TypeError: sequence item 0: expected str instance, list found

Do you have cert renewal working internally somewhere? Am I doing something unsual?