[Q] Android 5.0 Call forwarding bug topic

hey guys so im trying to get a little help squashing this bug on 5.0, every aosp rom i use on my verizon lg g3 has this annoying call forwarding bug that i cant seem to get rid of, the bug appears when i use mobile data, when i use wifi its fine, can anyone shed some light on this bug, im sure at least a few people other than me have experienced this as well. any help is appreciated, thanks