Some variegated plants, like this, are chimeras. Chimeras are a mosaic of 2 tissue types, in this case one tissue type has normal green chloroplast development and the other does not. In many cases they will persist for long periods of time as a mixture of cells in each growing meristem, so nearly every leaf and segment of stem gets some mixture of green and non-green tissue.
Sometimes one tissue type or the other randomly drops out and you get a nearly or completely green or non-green shoot. Sometimes the apparently missing tissue type will still be there, buried inside the stem where you can't see it. Then it may re-emerge at any time. But if one tissue type is completely missing in a new growth it will probably never revert to the variegated pattern.
If you get a completely non-green shoot it will persist for a while as the rest of the plant supplies it with energy from photosynthesis, but sooner or later it will usually stop growing.
It isn't cultural or environmental, more like a roll of the dice, though sometimes a period of particularly fast growth will change the odds and make it happen more frequently.
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