Could you please check if the "Multipath-based storages." and "Remote directories accessed using the FCoE (Fibre Channel over Ethernet) protocol." is unsupported ?
This appears to be mistakenly added in unsupported target.
Also refer: https://access.redhat.com/solutions/223773

Reported by: rhn-support-pray

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/supported-kdump-configurations-and-targets_managing-monitoring-and-updating-the-kernel#annotations:db699286-741b-4c46-b1f9-b959f9d2fb8c