Brand new iPad Air 4 purchased yesterday. After initial setup, iOS update (14.4), and a bit of browsing/YouTube, we charged it to full, unplugged it, and went to bed. This morning it was at 25%! Just like SoupLauncher's screen shot, it uniformly drained overnight.
I really wish I had found this thread before purchasing. The Source's policy is no returns on Apple products (which I didnt care about at the time as we've never had a problem with any of the iPhones and iPads we've had over the years), so our only option is to fight with Apple for a fix. I fear its going to be a long, protracted battle which, at best, ends with a refurbished iPad to replace a days-old one.
Next step will be to do it again today, take screen shots for evidence, and open a case with support. <sigh>