Campus Technology have put together “15 Mistakes Instructors Have Made Teaching with Technology in the Pandemic
It is a pretty good summary of the Educause research paper “Student Experiences Learning with Technology in the Pandemic“. Section 5 of the paper “Most effective use of technology” is worth a look.

There are no real surprises. The issues mostly originate from shifting a cohort of f2f educators into online teaching with very little preparation. It does provide a useful guide to future practice, in fact you could probably structure an online teaching course around the 15 points.
I think the more interesting research will be about how academics use the new skills and attitudes change their teaching and student support in the future. When I find some I’ll post a link.