Wayland windows does not redraw itself

I'm not sure, if it is not a bug of certain Wayland applications.

Under Ubuntu 20.04, Gnome 3.36, some Wayland-native applications, namely Audacity(2.3.3) and Firefox (76.0), does not redraw themselves unless I change their size, or switch to another window or overview. For example, audacity does not redraw current position marker, and I need to click with a mouse, or resize the window to see it. Firefox sometimes just freeze, until I click or until I resize its window, or I switch to overview.

What kind of trace shoud I perform to obtain more information?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-session-wayland (not installed)
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri May 8 17:27:24 2020
InstallationDate: Installed on 2019-11-16 (173 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-session
UpgradeStatus: Upgraded to focal on 2020-05-02 (6 days ago)