Cannot create custom partitions on a rhel 8 installation

I am trying to install RHEL 8 on an older server that had been running CentOs 7 and can't seem to do custom partitions even though it will install if I allow it to create the partitions. Every time I try to do a custom install I get the error message: /boot file system cannot be type lvmlv. raid0 may not have enough space.

I did an automatic install and logged in to see how the disk was partitioned:

I tried repurposing the existing partitions created by the automatic install to the new installation. I tried deleting all partitions and repartitioning it using the same sizes. I even tried to use fdisk from a Slackware installation DVD to rewrite the partitons so that the RHEL installation wouldn't see the data from the old install. However, I got failed to write disklable. Operation not permitted.

I have 4 disks configured as a Raid 5 in the BIOS. And, as I said, it is an older server that does not support efi.

I can always do an automatic install and use lvm to create the additional partitions. But, I would like to figure out how to do this during the installation process.