Some gel renders with black squares

[wolfestridershooter]

Bug reported by wolfe_strider on Trello on November 13th

Description: I’m not sure if this is related to the other black square bug because it only happens on some gels

Example: Video example: https://www.youtube.com/watch?v=DFpAFnaDFPo Preview image:

[xoxor4d]

Revisit when a way to fix #60 was found