When testing Jakarta EE 11 features with Payara, I encountered this issue, payara/Payara#7696
It has been certificated with Jakarta EE 11 Tck. But when I used Java 8 DateTime in REST response body, it failed. Internally, it used Jackson to serialize/deserialize the payload data, but not included the JSR310 modules.
Jakarta REST should ensure all serial/deserialization that work well in JSONB also work in HTTP request/response body.