422 error after switching to scala version 3

I’ve been using scala version 2.13.8 in our framework without an issue. When I upgraded the scala version 3.0, it started giving me ‘422 unprocessable entity’ error for my login request. When I switch back to 2.13.8, problem goes away. What could be the issue?

Gatling only supports Scala 2.13.
If you upgrade to Scala 3, you’re in unsupported uncharted lands.

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