VPN broken after upgrading to version 7

Just upgraded my router to the latest stable 7.x from 6.x

After the upgrade VPN (SSTP for win, L2TP for mac) was broken, VPN clients cannot connected from WAN. Strangely VPN connections still worked on the internal network.

I’ve temporary “solved” the problem by downgrading to 6.49.13 longterm.

It is clear that something has changed in VPN configuration in 7.x, but what has been changed?
Is there any documentation about what should be changed in the VPN configuration for 6.x to 7.x upgrade?

Whole 7 is different beast than 6 so the best way is you should recreate your configuration from scratch on an additional router for tests and than move it to production. Upgrade mostly works but …