Had same problem with 7.1.3 and solved by removing IPMI Tools, Unassigned devices and Unassigned devices plus plugins. After reboot the array started normally.
After updating to version 7.1.3 2025-06-04 I got this with my pass-through Ryzen 9 3900X (not migratable, no hyper-v) when booting to Windows Server 2025. Super annoying as even booting in Safe Mode doesn't work and if I change the processor to QEMU doesn't start the boot loading at all :(
When viewing my server's properties from Unraid Connect, I get 0 servers installed, 0 started. There are actually four (4) servers installed but none started.