Hi yassine_fadh1,
Yes, the input packets were seen previously as well, and another difference I can think of is the auto-negotation in the configuration you shared. Could you try disabling the auto-negotiation on the xe-0/0/19 interface on which this is not working and confirm ? Command:
# delete interfaces xe-0/0/19 ether-options auto-negotiation
# commit and-quit
show interfaces xe-0/0/19 extensive Physical interface: xe-0/0/19, Enabled, Physical link is Up .. MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Auto-negotiation: Enabled, Remote fault: Offline, Media type: Copper show interfaces xe-0/0/20 extensive Physical interface: xe-0/0/20, Enabled, Physical link is Up .. MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Auto-negotiation: Disabled, Remote fault: Offline, Media type: Copper
Hope this helps. 
Please mark "Accept as solution" if this answers your query / resolves the issue.
Kudos are appreciated too!
Regards,
Sharat Ainapur