No units of the 20th Combined Arms Army were known to be using BMP-1 IFVs at the beginning of the invasion, but there have been multiple sightings of 20th CAA marked BMP-1s this past month.
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The appearance of BMP-1s with the 20th CAA implies that they are using older equipment to replace losses. This thread will attempt to document all cases I've seen.
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Biriuch, Belgorod Oblast, Russia (h/t @COUPSURE)
05 September 2022
At least six BMP-1, with one having a visible 20th CAA rhombus.
Also note the spray-painted "4/8," a marking which has been seen on many pieces of 20th CAA equipment recently.