Option arp_interval: mode dependency failed, not supported in mode 802.3ad(4)

Since OpenWrt 25.12.x, I’m getting:

option arp_interval: mode dependency failed, not supported in mode 802.3ad(4)

When booting up with a bonding in my lan.

The switch doesn’t report anything wrong.

Removing

    option monitor_mode 'arp'

Means the bond doesn’t come up.

With this combination it the bond, everything works fine:

    option link_monitoring 'mii'

    option primary_reselect 'failure'

    option monitor_mode 'arp'

May be I’m wrong, but my understanding is that Mii link monitoring is the best choice, but I’m confused with the fact that if I remove arp, it doesn’t work …