Spamsieve task switching icon pixellated?

While training messages, I noticed that the SpamSieve icon of it being busy (with the downward arrow) is pixellated on the task switcher.

Minor issue, but should be easy to fix.

I will look into this. Do you have a screenshot?

Had to use my phone to take a photo.

Ah, I see. So it looks fine for you in the Dock, but not with Command-Tab?

No, it’s also blurry in the dock, but the dock is usually hidden for me, so I hadn’t noticed it!

OK, thank you for clarifying. Which version of macOS are you using?