Upgrading 25.1.1 breaks .Adding extra escape characters to JSON payload

Flow
1

Post upgrading to vaadin 25.1.1.
My endpoints have started adding escaping in the payload. Looks like its first stringifying and then deserializing leading to breakage of existing working functionality. i was using Vaadin 25.0.4 before with Jackson 3.1.x,Spring boot 4.0.x

"{\"authorities\":[\"OIDC_USER\",\"ROLE_ADMINS\"],\"email\":\"admin2@groovymaven.dev\",\"firstname\":null,\"id\":\"982813687163537752995569298169283862\",\"lastname\":null,\"name\":\"d19b6560-3021-708b-be33-758681dc4104\",\"setupComplete\":false,\"username\":null}"

Am i missing some configuration or settings?

2

Can you a bit more context.

How does the endpoint and the dto look like