The lines from 2323 to 2337 shows to me that internal the 0 is used for disabling the feature if no avp is set. https://github.com/kamailio/kamailio/blob/master/src/modules/rtpproxy/rtpproxy.c#L2323-L2337

So the check could be changed to:
ice_candidate_priority_val.n < 0 || ice_candidate_priority_val.n > 2

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