nftables: adding a set produces an error while using the "dynamic" flag

Issue

[root@rhel-80 ~]# nft add table ip filter
[root@rhel-80 ~]# nft add chain ip filter input { type filter hook input priority 0 \; }
[root@rhel-80 ~]# nft add set ip filter blacklist { type ipv4_addr \; flags dynamic, timeout \; timeout 5m \; }
Error: syntax error, unexpected string, expecting constant or interval or timeout
add set ip filter blacklist { type ipv4_addr ; flags dynamic, timeout ; timeout 5m ; }