Difference between LVGL7.11.0 and LVGL8.3.7

General discussion
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Hi Guys, I found an issue when I try to do something with LVGL.

I create a application with LVGL on IMX6ULL with TFT 10.1 inch(TFT clock 70M).

  1. The application runs correctly with LVGL7.11.0, TFT clock 70M
  2. The application runs with screen flicking when screen has update with LVGL 8.3.7, TFT clock 70M
  3. The application runs correctly with LVGL 8.3.7, TFT clock 60M

So my point is what is the screen fresh difference between LVGL7.11.0 and LVGL 8.3.7?