@referee101 Hello again.
Our new installer does have an “ignore drives above” size setting as a ‘saftey’ measure:
So it could well be just that, i.e. if the drives you have prepared are greater than 5 TB they are considered, as a safe-guard, to be more likely data disk members or intended members. It’s a way to help folks not accidentally select a data disk or intended data disk during the install. With the assumption that smaller devices than this are likely to be selected for the system disk.
See the following subsection of our installer howto:
Use cursor keys to highlight, then the “Enter” key to select. Only devices less than 5000 GB (5 TB) are shown. Larger disks are assumed to be data disks.
Also what @Hooverdan said as we expect a separate/dedicated system disk to install to, in order to maintain system/data seperation.
Hope that helps.