Jersey invoking arbitrary versions of my methods that share the same url

Question

I have 2 endpoints in Jersey configured for the same URL, but each one generates a different type of data (JSON or CSV).

When a request comes with the header Accept: application/json I see getDataJson is invoked, and when it comes with Accept: text/csv I see getDataCsv is invoked.

Nonetheless, when a request comes with Accept: */*, I expected one of the methods to be invoked consistently (getDataJson if it's the first one) but instead, I have a server where Accept: */* always causes getDataCsv to be invoked, and another server where getDataJson is always the one invoked.

Do you know what could be the reason Jersey's behaviour is not consistent?

    @POST
    @Path("customer/{custId}/search/stuff")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces({MediaType.APPLICATION_JSON})
    MyDataResponse getDataJson(@PathParam("custId") UUID custId,
                               SearchParams params);

    @POST
    @Path("customer/{custId}/search/stuff")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces("text/csv")
    Response getDataCsv(@PathParam("custId") UUID custId,
                        SearchParams params);

More info:

• I'm using Jersey 2.33
• I already ran sha256sum on the jars of my app thinking maybe there was a difference, but they are identical.
• I found some docs here, but the section Procedure 8.2. MessageBodyReader<T> Selection Algorithm didn't give me the info I wanted