Late response, but I fixed it by changing the TTL. More info: OpenWRT TTL manipulation on a travel router explained · GitHub
Installed package: iptables-mod-ipopt
And made this persistent: iptables -t mangle -I PREROUTING 1 -j TTL --ttl-set 65
I first validated the execution manually to make sure no errors popup.
Then validated by doing a ping to 1.1.1.1 for example. This then should show a TTL of 65, and not 64 anymore.
Other source: Changing TTL in OpenWrt 22.03 - #11 by wcs2228