the automatic part is a first pass “best guess” by the engine. like many “automagic” things you can still go in and fine tune it. for your case they don’t directly expect a face rig and/or breasts, especially going from the UE4 skeleton to the UE5.3 skeleton which added support for things like face rigs from MetaHuman.
the Automatic portion is based on “expected” rigs from specific verndors that are generally consistent in their structure (doing all the things you would end up doing in other tools or in making a retarget asset)
try selecting one of the animations you are interested in, right-click select “retarget Animation” then you will be able to go through the process of the previous retarget system where you get a lot more control. you can also do this from a more blank sleight by in the content browser creating a retarget asset (I don’t have Unreal open right now, but I think it is under animations)
the reason that many animations from the market will give you similar results is one of the expectations is they work with the standard control rig (so Manyy and Quinn) so any “bads” with those rigs will be in those as well.