I had a working tinc setup with multiple routers (all running openwrt 19.07) connecting directly with each other (as far as I remember I used this guide), but after upgrading first router to 21.02 it broke. It basically broke my lan network, as it was usurping its IP for the tinc interface. Said guide gives some tips on how to make it working again, but it advises using a tap (L2) instead of tun interface, and creating some additional bridge. (If I understand it correctly) I'd have to reconfigure all of the routers to use this (tap instead of run), which is not a possibility for me right now, so I reverted to 19.07 on the router I made this change on. Is there any other way?