ESXi -> Proxmox -> pfSense all bridged to same lan, possible?

[proxmox_user]

Hello all,

as described in the object I've a ESXi with installed on it Proxmox with installed on it a pfSense fw

Routerboard Mikrotik: 192.168.1.1
ESXi: 192.168.1.10
Proxmox: 192.168.1.12
pfSense: 192.168.1.15

everything is bridged but:

from ESXi I can ping Proxmox, Mikrotik but not pfSense
from Proxmox I can ping ESXi and pfSense
from pfSense I can only ping Proxmox

despite they are all on the same bridge network, from pfSense I can't ping hosts locate deeper than Proxmox level.

Is it normal?

Thanks a lot