Same, I've worked with 2 4K displays on both with a 2018 MBP15 and 2020 MBP16 for the last year, I've never noticed any of these problems. 1 connected with DP,

Same, I've worked with 2 4K displays on both with a 2018 MBP15 and 2020 MBP16 for the last year, I've never noticed any of these problems. 1 connected with DP, the other with HDMI.