This is decorative and NetworkManager intend to change a lot on this bond options handling in RHEL 8.3.

Moving bug to RHEL 8.3.

verion:
nmstate-0.3.2-1.el8.noarch
NetworkManager-1.26.0-0.1.el8.x86_64
DISTRO=RHEL-8.3.0-20200616.0
Linux hp-dl388g8-08.rhts.eng.pek2.redhat.com 4.18.0-214.el8.x86_64 #1 SMP Fri Jun 12 08:55:08 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux


#do the following:
rmiface ()
{ 
    echo interfaces: > /tmp/rmiface_temp.yaml;
    for ifname in "$@";
    do
        if echo $ifname | grep --color=auto %; then
            ifilter=`echo $ifname | sed 's/%/.*/g'`;
            iflist=`nmstatectl show | grep "^- name: $ifilter" | awk '{print $3}'`;
            for iface in $iflist;
            do
                echo -e "- name: $iface\n  state: absent" >> /tmp/rmiface_temp.yaml;
            done;
        else
            echo -e "- name: $ifname\n  state: absent" >> /tmp/rmiface_temp.yaml;
        fi;
    done;
    nmstatectl set /tmp/rmiface_temp.yaml
}

for mode in balance-tlb balance-alb balance-rr active-backup balance-xor broadcast 802.3ad; do
    echo =============================================== $mode ==================================================
    cat << EOF > $mode.yaml
interfaces:
- name: bond0
  type: bond
  state: up
  link-aggregation:
    mode: $mode
    slaves:
    - veth1
    - veth0
EOF
    nmstatectl set $mode.yaml
    nmstatectl show bond0 > state-$mode.yaml
    rmiface bond0
done

# when done, check state-*.yaml, for all the modes, there is only one option 'miimon', and if you change the mode of an existing bond without explicitly set values, it will set all the options to default

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-2020:4696