Aspect Ratio issues (borders) - even with "Keep Aspect Ratio" enabled

[copyitright]

I've tried both 2.0.4 and the 2.0.5 fork, and with both plugins i experience aspect ratio issues whereas instead getting a full picture, i see horizontal borders (16:9) or borders on the side when having "Keep Aspect Ratio" ticked.

I've already played with the Base/Canvas resolution of OBS and despite having tried different aspect ratio resolutions (mainly 16:9 and 4:3) i keep getting borders, with or without the "Keep Aspect Ratio" ticked.

The source i'm recording from is in 4:3 so i expect to see no borders when using a 4:3 Base/canvas resolution. Unfortunately that isn't the case.

My OBS version is 26.1.0 (64-bit) @ Windows 10 Enterprise Version 2004, build 10.0.19041.685