Not for me,and I have top staus on both,hapend 2 times,told me they did not do this.
Hell,-UA dont even interline with themself on separat tickets,had a EWR-DFW and a separat DFW-IAH 6 hrs later,they would not send my bag to IAH,then they would not check inn my bag 6 hr prior to the flight in DFW,ended up hauling a full size suitcase around (but thats another UA story).