Guest Network on WAX160 / AX1800

Based on an earlier report, the SSID Client Isolation seems to have a flaw, probably related to the intro of the mid 2021 "option to specify network devices that are exempt from WiFi client isolation" - this is probably what you are experiencing now. This flaw seems to exist on other WAX6xx APs with current firmware as of writing, too.

Intended is that some kind of (undisclosed details) L2 isolation does take care of blocking the WiFi clients by SSID from any local network, while retaining Internet access as documented in the Insight Managed WiFi 6 AX1800 Dual Band Access Point Models WAX610 and WAX610Y User Manual 

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Enable or disable client isolation for a WiFi network
By default, client isolation is disabled for a WiFi network (SSID or VAP), allowing
communication between WiFi clients that are associated with the same or different WiFi
networks on the access point. For additional security, you can enable client isolation so
that clients that are associated with the same or different WiFi networks cannot
communicate with each other, except for communication over the Internet, which remains
possible.

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Don't blame the writer - we're implementing guest networks using the much stricter dedicated VLAN and appropriately configured security zones (like many other) - that's why many of us [especially those with strict Insight managed VLAN environments] never experienced the issue.

RaghuHR please let engineering to look into this issue, and inform your customers about intended fixes.