getSetCookie is not a function

I've upgraded a Workers project by bumping Hono and Wrangler by a few minor versions. In staging, I'm now seeing:

"TypeError: this[#res].headers.getSetCookie is not a function"

in my streaming logs. This didn't exist before.

Anyone have ideas on how to resolve this or suggestions on where to dig? Does this sound like a Hono, Node, or Workers?

More Info: I reverted Hono back to the original version and still have the same issue.
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