Prijedlozi / Platforma za Greške

Trying to apply a labymod cloak which has a black background surrounding an image but it won't work. The exact same cloak works with every other shade of color except for specifically black (#000000 to #0E0E0E from what I tested). Is there a specific reason for this? Sorry for the minor inconvenience I'm just confused.

(When trying to apply black cloak) https://gyazo.com/0b493cf2b47ca5b5439126080380dc03

(Cloak with black background) https://gyazo.com/69a1618cfc67842700a58106f6acc7c0

(Cloak with dark grey background) https://gyazo.com/1c0dd922e616ae413ed09e69bcc742e4

Both cloaks are the same size and have a width of 352 pixels and height of 272 pixels, the darker grey border on both screenshots is just from the background on the image editor I use.
https://gyazo.com/69a1618cfc67842700a58106f6acc7c0

Operating System: Windows 10
Browser: Chrome