HiDPI Yaru window controls are tiny after reboot

[Larry Bushey]

Information:
1. Distribution Release: Ubuntu MATE 21.04
2. Package: mate-control-center 1.24.2-0ubuntu1
3. Theme: Yaru-MATE-dark

Expected result: Window controls (buttons) for all themes retain HiDPI scaling after reboot.
Actual result: When using HiDPI and either the Yaru-MATE-dark or Yaru-MATE-light theme, after reboot, the window controls are not sized with correct scaling. They appear tiny.

Steps to reproduce:
1. Select Yaru theme.
2. Select HiDPI display resolution.
3. Select HiDPI scaling in MATE Tweak.
4. Restart computer.

Workaround:
1. Open MATE Tweak.
2. Select 'Regular' scaling. (Selecting 'Auto' does not work to fix it.)
3. Select 'HiDPI' scaling.

Result:
Window controls are now scaled correctly.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: mate-control-center 1.24.2-0ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sat May 8 08:58:55 2021
ExecutablePath: /usr/bin/mate-appearance-properties
InstallationDate: Installed on 2021-04-22 (15 days ago)
InstallationMedia: Ubuntu-MATE 21.04 "Hirsute Hippo" - Beta amd64 (20210331.1)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: mate-control-center
UpgradeStatus: No upgrade log present (probably fresh install)