Hi Eugene,
Sorry for the issue! In this fling v2 the support for 64 KB granule size has been removed as some virtual devices are not working properly in that configuration. Unfortunately the RHEL 8 and other distributions based on it were using those 64 KB page size. Starting with RHEL 9 the default kernel is using 4 KB granule size, and has an optional 64 KB kernel.
We are adding a config option to allow using 64 KB granule for the next fling v2 update, but this will be an unsupported option. It will however let you run the VM and update it to a 9.x version using the 4 KB page size.