Link handshake trouble: certificates and keys can get out of sync

I'm running a recent tor master as an authority in a tor testing network:

[notice] Tor 0.3.1.0-alpha-dev (git-0266c4ac819d9c83) running on Darwin with Libevent 2.1.8-stable, OpenSSL 1.0.2k, Zlib 1.2.11, Liblzma N/A, and Libzstd N/A.

I get this warning every so often:

[warn] Received a bad CERTS cell: Link certificate does not match TLS certificate

Is this expected?

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