Sophos Firewall Home Edition - Possible issue with WebUI Diagnostics – Traceroute and Ping failing to VLAN via LAN interface

Hi everyone,
I hope you can help me out here. 

I found something quite strange, but since I just started using Sophos recently, I might have misconfigured something.

Via WebUI, when I go to Diagnostics and try to run a ping or traceroute to a specific VLAN using the LAN interface, I always get 100% packet loss on ping, and on traceroute I see multiple host unreachable (!H) responses.

However, when I perform the exact same test via the CLI (console), everything works fine. I can ping the destination and get a proper traceroute result.

Here is an example of the WebUI traceroute output:

Traceroute to 192.168.7.2 (192.168.7.2), 30 hops max, 46 byte packets
 1  *  *  *
 2  192.168.1.235  48.110 ms !H  *  *
 3  *  192.168.1.235  68.253 ms !H  *
 4  *  *  192.168.1.235  68.085 ms !H
 5  *  *  *
 6  192.168.1.235  68.925 ms !H  *  *
 7  *  192.168.1.235  67.119 ms !H  *
 8  *  *  192.168.1.235  68.349 ms !H
 9  *  *  *
10  192.168.1.235  67.822 ms !H  *  *
11  *  192.168.1.235  68.479 ms !H  *
12  *  *  192.168.1.235  67.992 ms !H
13  *  *  *
14  192.168.1.235  70.116 ms !H  *  *
15  *  192.168.1.235  68.280 ms !H  *
16  *  *  192.168.1.235  69.090 ms !H
17  *  *  *
18  192.168.1.235  69.123 ms !H  *  *
19  *  192.168.1.235  74.238 ms !H  *
20  *  *  192.168.1.235  65.492 ms !H
21  *  *  *
22  192.168.1.235  68.467 ms !H  *  *
23  *  192.168.1.235  73.351 ms !H  *
24  *  *  192.168.1.235  69.655 ms !H
25  *  *  *
26  192.168.1.235  63.660 ms !H  *  *
27  *  192.168.1.235  68.248 ms !H  *
28  *  *  192.168.1.235  68.541 ms !H
29  *  *  *
30  192.168.1.235  68.723 ms !H  *  *

192.168.1.235 is my Sophos firewall
192.168.7.2 is a device on one of my VLANs

And here is the same test via shell:

SFVH_KV01_SFOS 21.5.0 GA-Build171# traceroute 192.168.7.2
traceroute to 192.168.7.2 (192.168.7.2), 30 hops max, 46 byte packets
 1  192.168.7.2 (192.168.7.2)  3.293 ms  1.035 ms  1.141 ms