Multiple set-cookie headers merged into one

I am using Cloudflare Pages with Next.js + Auth.js for OAuth. Every time I try to log in with (let's say) Google, it's not possible, because the callback response has the

session-token

session-token

cookie merged into the same

Set-Cookie

Set-Cookie

directive as

pkce.code_verifier

pkce.code_verifier

. On development I get two

Set-cookie

Set-cookie

headers instead of only one and it works as expected. How can I make sure those headers don't get merged?

Multiple set-cookie headers merged into one

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Multiple set-cookie headers merged into one

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