Preserving Closed Captioning when converting files

Is there any way to convince AME to preserve CC data in files when converting?  I work at a TV station and I need to occasionally flip shows and commercials from whatever format they come in to MPEG2, but I can't seem to get AME to preserve the CC text streams in the files.  Currently I have a watch folder set up and I just drop whatever needs flipping into that and let AME do it's job with a specific preset I've made to best match our play-out system.  I'm using 2017 and 2018 with the same results.