background color from setup doesn't persist in fullscreen on Mac

[lee2sman]

Describe the bug
This is a bug on Mac (and iOS) but not Linux. Need to test on Windows. If you set a background color in setup, and go fullscreen, the color doesn't get displayed on screen.

To Reproduce

require 'L5'
function setup()
  fullscreen()
  background(0)
end

Expected behavior
Background should be black. Instead, it is the default gray.

Platform:

• OS: macOS 11.7.10 (Retina, 2014 Macbook)
• L5 Version: 0.1.3

Additional context
ALSO tested on iPad in love2d-studio. Same issue! iPadOS 26.2 - iPad mini 5th generation.