possiblity of broadcast storm loop between L3 interface and L2 interface

[ys]

Recently I faced network outage due to a lot of packet storm.
I did not identify it was due to broadcast or not. but I would like to know possibility.

I have L3 link and L2 trunk link from switch-A (ICX7750) to switch-B (ICX7450) with config below.
In case of happening broadcast from vlan 1 accidentally, any possibility to broadcast storm loop on vlan 1?
Also possibility to forward these broadcast packets to eth1/1/3 connecting to different switch?

Because route-only L3 interface is still a member of vlan1 by default on ruckus switches.

---
!
! SWITCH-A
!

vlan 1 name DEFAULT-VLAN by port
!
vlan 3000 name LAB by port
tagged ethe 1/1/2
router-interface ve 3000
spanning-tree 802-1w
spanning-tree 802-1w priority 0
loop-detection
!

int e 1/1/1
port-name To-SWITCH-B_L3
route-only
ip address xxx.xxx.xxx.xxx/31
!

int e 1/1/2
port-name To-SWITCH-B_L2
!

int e 1/1/3
port-name To-SWITCH-ZZZ_L3
route-only
ip address zzz.zzz.zzz.zzz/31
!

---
!
! SWITCH-B
!

vlan 1 name DEFAULT-VLAN by port
!
vlan 3000 name LAB by port
tagged ethe 1/1/2
untagged ethe 1/1/9 to 1/1/10
spanning-tree 802-1w
loop-detection
!

int e 1/1/1
port-name To-SWITCH-A_L3
route-only
ip address xxx.xxx.xxx.yyy/31
!

int e 1/1/2
port-name To-SWITCH-A_L2
!

int e 1/1/9
port-name User Port
!
int e 1/1/10
port-name User Port
!