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QFX-5100 DHCP Relay Broken under 18.4?

I've upgraded a pair of QFX5100s to run 18.4R1, and DHCP relaying is now broken...  I rolled-back to 18.3 on one of them, and the previous functionality was restored.  Looks like new functionality with "tenants" was implemented, but that appears to break the base functionality.

 

Looking to see if anyone else is seeing this, and to give a heads-up to Juniper Support.  PM me for a PCAP. 

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