We have 4500 brand new 6th gen iPads and haven't seen any getting hot like that to my knowledge. I have seen other charging issues, either slow charging or mis-reporting charge levels but nothing heat related. It does seem like iOS 12.1 most of these have disappeared. I have wondered though if Apple got some less than ideal lightning connectors with several of the charging or lack of charging issues I have seen.
Found this helpful? Give me some Kudos! (click on the little up-arrow below)