Translucency Does Not Seem to be Working?

Version Info

• Caprine Version 2.54.1 (2.54.1)
• macOS Big Sur 11.5.2 (20G95)

Note: I tried both with and without hardware acceleration (and with multiple app restarts).

Expected Behavior

Caprine will show vibrancy/translucency as shown in the README when vibrancy is enabled:

Actual Behavior

Caprine looks the same with and without vibrancy enabled. (i.e. the application does not have any translucency, but it does have wallpaper tinting.)

Note that the application differs from the screenshot in other ways, as well: