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Verified with versions:
nmstate-1.0.2-14.el8_4.noarch
nispor-1.0.1-4.el8.x86_64
NetworkManager-1.30.0-10.el8_4.x86_64

Desired state applied: 
---
routes:
  config:
  - destination: 0.0.0.0/0
    next-hop-address: 0.0.0.0
    next-hop-interface: dummy
    table-id: 0
interfaces:
- name: dummy
  type: dummy
  state: up
  ipv4:
    enabled: true
    address:
    - ip: 192.0.2.1
      prefix-length: 24
  ipv6:
    enabled: false
[06:19:34@ci-vm-10-0-137-181 ~]0# ip route
default via 10.0.139.254 dev eth0 proto dhcp metric 100 
default dev dummy proto static scope link metric 550 
10.0.136.0/22 dev eth0 proto kernel scope link src 10.0.137.181 metric 100 
169.254.169.254 via 10.0.136.13 dev eth0 proto dhcp metric 100 
192.0.2.0/24 dev dummy proto kernel scope link src 192.0.2.1 metric 550

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (nmstate bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:3071