Newer LIFX bulbs flicker red/green at low brightness

I have a bunch of BR30s. Some bought recently (Pink-ish box packaging, P/N LHB30E26US), and some bought about two years ago (White cylinder packaging, P/N B30E26UC10V2).

The new bulbs that came in boxes alternate colors at low brightness where PWM is obvious (i.e. candlelight makes them pulse red-green-off), whereas the older ones do not – PWM is still obvious as they flicker with a slomo camera but it doesn’t alternate colors.

The newer ones ones that flicker are rather disorienting at low brightness, as they play tricks with the eyes, since they’re rapidly flickering between colors.

Here are 240fps slomo videos of each:

Is this a known thing? Can this be fixed in a firmware update?