The display collapses for a moment when the mouse moves on 20.20

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1)
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
(2020/02/08 daily build)

2)
~/$ apt-cache policy chromium-browser
chromium-browser:
  インストールされているバージョン: 79.0.3945.79-0ubuntu1
  候補: 79.0.3945.79-0ubuntu1
  バージョンテーブル:
 *** 79.0.3945.79-0ubuntu1 500
        500 http://jp.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

3)
reproduce:

- wakeup chromium-browser and open multi tab (about over 8 tab)
- Move web pages to the end
- mouse move on pages, chromium tab,url area

reproduce is need running other GPU application? (visual studio code, blender ... etc)

4)
upon:
The display collapses for a moment
- display unknown rectangle. (add screenshot)
- Page drawing swings from side to side.

It does not always occur. Even if the phenomenon occurs, it will heal and will happen again.

other)
AMD® Ryzen 5 1600 six-core processor × 12
Memory 48GB
Radeon RX 570 Series
~/$ lspci -nnk | grep VGA -A1
09:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1002:67df] (rev ef)
 Subsystem: Sapphire Technology Limited Radeon RX 570 Pulse 4GB [1da2:e353]

[[e-mail] (hibi-sasahara)]

screencast:
https://youtu.be/Hd0M2gQbEWI
https://youtu.be/8bmQwC0_OHM