ERR_SSL_PROTOCOL_ERROR in Chrome

For some reason on our site we get an SSL error when testing in Chrome here:

https://www.webpagetest.org/result/220112_BiDc80_56e63f9827315ecde7a0b8da0d74b0b8/

We don’t have any issues like this with normal users of the site. What could be causing this?

It seems to only happen on the ‘New York, NY- M1 Mac Mini’ system.

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