It happens to me too, when I start minecraft on my nintendo switch it takes 5 minutes (checked on my watch) to load, my save data is 1.5gb even I have nothing, I deleted all the things I've purchased and the size didn't go down, I have even deleted the data and redownloaded it (except for the save data because it doesn't upload to nintendo cloud for some reason I don't know) and it still takes 5 mins or more to load
In Nintendo Switch version 1.14.20 it still happens, I crafted 4 honey blocks (16 Honey Bottle) and only got 4 back, I lost 12 bottles in the process