I'm sorry but I don't understand why you did it if you knew it wasn't going to work.
Diags would be most helpful grabbed before shutting down the server, but if those are not available, boot the server, stop the array if set to auto-start, if Docker/VM services are using the cache pool disable them, unassign all cache devices, start array to make Unraid "forget" current cache config, stop array, reassign both the original cache devices (there can't be an "All existing data on this device will be OVERWRITTEN when array is Started" warning for any cache device), start array, grab and post the diags.