I’m yet another that’s had this problem. Harsh or abrupt 2-1 down shift with ‘19 Silverado outfitted with 5.3 and 8 speed transmission. Bad enough that my wife looks at me and asks if the truck is safe to drive. Dealer said they can’t duplicate it and everything seems ok. But it happens almost all the time with me. Problem seems to be when transmission temp gets up to about 180 or above. Abrupt shift happens when I reach about 6 or 7 mph when slowing. I tried the C4 learn yesterday and after one day I’ve not had the problem. Keeping my fingers crossed that this solved my problem.
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