The browning and breakdown happens regardless. Only part of the leaf is photosynthesizing. This happens a lot more in Monstera deliciosa albo-variegata than it does in Monstera D Thai Constellation or one of the 'mints' because the variegation in the latter 2 is integrated. It occurs in splashes and smatters, not big sectorial patches, so the green is able to compensate better for the white. This is also why Thai C is a stable variegation, and is able to be tissue cultured, and why albo is unstable and can revert either to all green or all white, and has taken years and years to get to tissue culture, and still there are crop failures
