Failover WAN and DNSFilter issue

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I have a USB 4G modem setup as a Failover WAN connection. My main internet failed today and it failed over to the USB modem as expected.

However DNS stopped working. I have the following settings that I have setup to force my family through the CleanBrowsing DNS filtering:

WAN DNS Setting
Connect to DNS Server automatically - No
DNS Server1: Cleanbrowsing custom IP
DNS Server2: Cleanbrowsing Custom IP
Forward local domain queries to upstream DNS - No

DNSFilter - ON
Global Filter Mode: Router

When I changed Global Filter Mode: DNS worked fine on the backup WAN link.

Any ideas what is going on here guys? What is the expected behaviour of DNSFilter set to "Router" when a Backup WAN link is active?

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