Look, even the basics of how a fallback order works is broken (or doesn't work as you would expect, imho). Taleworlds has been aware of this since I brought it to their attention in August in alfa-beta period 2019 here. Below is an updated video test of how fallback works in Warband vs Bannerlord.
I also want to bring this post here, talking about formations. I believe it is a video that TW should watch!