BUG #16391: Failed to initdb to use non-cluster storage

The following bug has been logged on the website:

Bug reference:      16391
Logged by:          gru fa
Email address:      grufarm@gmail.com
PostgreSQL version: 12.2
Operating system:   ArchLinux
Description:        

please fix allow use to initdb to point to any non-cluster path, sda2 or
even sdb2
I do not see that an issue so long it is same physical disk or even network
raid location
thanks