nextdns: OpenWRT: Client sets incorrect dnsmasq server address

Modified listen option in /etc/config/nextdns so NextDNS client binds on all interfaces in order to listen for mDNS across multiple local subnets. However, the :<port> value without an explicit IP causes the NextDNS client to generate an unusable server= entry for dnsmasq in /tmp/dnsmasq.d/nextdns.conf.

This causes dnsmasq to fail to start up.

NextDNS config:

root@OpenWrt:~# cat /etc/config/nextdns

config nextdns 'main'
	option enabled '1'
	option report_client_info '1'
	option hardened_privacy '0'
	option log_queries '0'
	option detect_captive_portals '0'
	option use_hosts '1'
	option cache_max_age '0s'
	option max_ttl '5s'
	option bogus_priv '1'
	option timeout '5s'
	option cache_size '100MB'
	option auto_activate '0'
	option listen ':5053'
	option setup_router '1'
	list config 'xxxxxx'

Resulting (incorrect) nextdns.conf output for dnsmasq:

root@OpenWrt:~# cat /tmp/dnsmasq.d/nextdns.conf
server=#5053
no-resolv
add-mac
add-subnet=32,128

Context

• Version [e.g. 1.5.2]: 1.5.7
• Platform [e.g. macOS, ASUS-Merlin]: OpenWRT (snapshot v20)