On SRX380, when using Integrated routing and bridging (IRB) interface, Virtual Router Redundancy Protocol (VRRP) VIP (Virtual IP) is not responding to pings (with accept-data configured)
and traffic is not routed through the configured VRRP VIP address.

When the issue happens, SRX380 with VRRP configuration on IRB interface will drop packets that are routed to the virtual IP address.
This causes complete packet loss and it is not possible to ping the VRRP VIP. Since the packets to VRRP VIP are dropped, traffic cannot be routed through the IRB interface.

This issue is resolved on the below junos versions:

20.3R3-S1, 20.4R3, 21.1R2, 21.1R3, 21.2R2, 21.3R1, 21.4R1

Please refer PR1581554