You may see the following error message in VXLAN environment. 

Oct  7 16:31:51.137 2022  d16-25 : %PFE-3: fpc0 Failed to get ifl for ifl index = 640

This can happen when the device receives DHCP packet via a remote vtep and L3 interface (IRB) is not assiged on the egress interface.
Even though there is no DHCP configuration, the packet injection happens and it fails to get IFL index as there is no IRB interface on the egress interface.

This issue might be seen if the following conditions are met:
* On QFX 5K series platform and EX4600 series.
*  In VXLAN environment
* Receiving DHCP packet via remote vtep
* No IRB interface on the egress interface.

This is reported on PR1721318 https://prsearch.juniper.net/problemreport/PR1721318

Resolved-In
junos:20.4R3-S8 junos:21.2R3-S6 junos:21.4R3-S4 junos:22.2R3-S1 junos:22.3R3 junos:22.4R3 junos:23.1R2 junos:23.2R1 junos:23.2R2

Workaround
You can ignore the error message or you may assign L3 interface (IRB) to the vlan. The DHCP packet is forwarded to the egress interfaces as expected.