Firewalld fails to load the ruleset with error message internal:0:0-0: Error: No such file or directory

Issue

• The firewalld service starts and it's running, but there's no ruleset loaded and file /var/log/firewalld shows the following error message:

  ERROR: COMMAND_FAILED: 'python-nftables' failed: internal:0:0-0: Error: No such file or directory
  

• The firewalld service starts and it's running, but there's no ruleset loaded and file /var/log/firewalld shows the following error message:

  ERROR: COMMAND_FAILED: 'python-nftables' failed: internal:0:0-0: Error: Set member cannot be prefix, missing interval flag on declaration
  

• After adding permanent entries to a ipset via firewall-cmd, running firewall-cmd --reload or systemctl restart firewalld doesn't work anymore and firewall rules are not loaded.

• After adding a new service or icmp type to a zone, reloading firewalld fails.