Why VRRP heartbeat packets cannot be transmitted normally between VRRP master and backup devices when VRRP packets are sent in a Super-VLAN

For S series switches, by default, VRRP Advertisement packets of a super-VLAN are sent only to the sub-VLAN that has the smallest VLAN ID among all the sub-VLANs in Up state. VRRP heartbeat packets cannot be transmitted normally between VRRP master and backup devices when the link between them does not allow the first Sub-VLAN of the Super-VLAN. The vrrp advertise send-mode command can be used to cancel or configure the mode in which VRRP Advertisement packets of a super-VLAN are sent.

Other related questions:
How are VRRP packets of an S series switch sent in a super-VLAN
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