I don't see a Mojolicious 9.30, but the Changes file mentions:

Swiched from HMAC-SHA1 to HMAC-SHA256 for signed cookies. Note that this means that all sessions will be reset.

To me, this means this is expected behaviour. I don't know if/how you can migrate the signed cookies from the old version to the new version automatically. I guess you would need to have two code paths. One that receives and validates the HMAC-SHA256 cookies, and one that gets taken when the SHA256 validation fails (maybe copied from the old Mojolicious distribution), that validates against the old HMAC-SHA1, and does an upgrade.

In reply to Re: Cookie not signed after upgrading mojolicious by Corion
in thread Cookie not signed after upgrading mojolicious by newperldeveloper

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