Please try to set the native vlan ID on the interface facing the CE.
JTAC@EXSWITCH# show interfaces ge-0/0/1
description port-facing-CE;
flexible-vlan-tagging;
native-vlan-id 1;
encapsulation extended-vlan-bridge;
unit 100{
vlan-id-list 1-4094;
input-vlan-map push;
output-vlan-map pop;