I have the same problems as Franco with a pi4b, and a usb3 ssd. (LE 9.2.5.). Tested with 2 different hdd enclosures, both worked on the usb2 ports, one didn't work at all at a usb3 port, the other one was very slow.
On a different Pi4 with raspbian buster, kernel 5.4.51-v7l+, everything works very good...
I suppose It's not only an issue with several usb chipsets, but with the kernel itself?
LE 9.2.5 has still kernel 4.19...
In this thread
people tell that the problems went away after upgrading to the newest kernel.
When Will the next LE Version with kernel 5.4 be available?