Mate 20.04: "Show Desktop" icon loses style settings

[Simone]

Systems: Ubuntu Mate 20.04, LinuxMint 20 Mate Beta
1. In Mate Tweak, choose in Panel: Redmond
2. Right-click on bottom panel -> New Panel
3. Right-click on panel at the top -> Properties
- choose "Left" as position
- take out "Expand"
- and choose size of 47
4. Right-click on the new left panel -> Add to Panel
5. Add some apps and have "Show Desktop" as one of them
6. Restart the system
Result: "Show Desktop" icon in the left panel has lost its equal top and bottom padding, and distance to the icon before and after is smaller.
7. Right-click on the Panel -> Properties
8. Change the icon size to 48 and then 47 again
Result: Distance is kept until a restart of system.
Expected result: Show Desktop shouldn't lose the distance settings and it worked fine in UM 18.04 and LinuxMint.

Note: I set up LinuxMint Mate 20 Beta in Virtualbox and found the same problem. This issue seems to be in relation with the Mate Desktop.

[Simone (newhere)]

Issue is fixed and no longer happening in UM 20.04.3.

@Norbert, please close the report.