The 'show arp' output doesn't resolve DNS name. This works fine in MX & other non-evo routers.

In EVO box-
root@jtac-evo> show arp 
MAC Address       Address         Name                      Interface               Flags
88:28:fb:1d:27:a8 172.50.1.2      172.50.1.2                et-0/0/5.300            none
fc:96:43:82:a4:57 128.39.254.60   128.39.254.60             et-0/0/6.0              none
Total entries: 2

Fix provided using the PR is a toxic fix and hence engineering reverted the fix provided in a later stage.
Issue is not fixed as of now and is still under engineering review, as engineering feels this may need an enhancement.

PR1778567 was raised & tracked in the same PR.

From 25.2R1-EVO onwards, we can resolved output using inbuilt script in device - arpHost.py

[vrf:none] root@jtac-evo:~# arpHost.py

MAC Address          Address         Name                                Interface            Flags

----------------------------------------------------------------------------------------------------

00:05:86:9b:74:00    10.10.10.6      10.10.10.6                          et-1/0/1.0           none

00:05:86:9b:74:00    10.10.10.10     testhost1.jnpr.net.                 et-1/0/1.0           none