After the latest hotfix patch i started a brand new Custom difficulty multiplayer Game with my friend where i set a Custom difficulty with Honour Ruleset and everything else to Tactician.
We got to the phase Spider boss and realized she does not have the Gossamer Tomb legendary action, meaning the Honour ruleset was not actually activated!
So we made a whole new game, again chose all the correct Custom Difficulty (Honour Ruleset+Tactician) options and this time went straight to the Owlbear cave to check will she have her legendary action Companion.
But the Owlbear did not have the legendary action , meaning again the lobby did not properly save our chosen Honour custom ruleset.
We both exited the game, verified Steam files and got into a third brand new Game lobby.
Then we noticed that as we changed the "Number of Slots" (from 2 to 4) the customised ruleset options we chose would get all messed up and changed.
And that in general any kind of interaction with the UI in the lobby seemed to cause the Customed Ruleset to either get desynced between us or changed from what we chose.
In the end we were unable to host the game with the simple setup of Honour Ruleset and Tactician everything else.
We did not use any mods.
TL;DR: Multiplayer Lobby is unable to host the chosen Custom Difficulty with Honour Ruleset and everything on Tactician difficulty.
Something in the Lobby is causing the Custom Difficulty to be reset from the chosen Custom difficulty onto some standard/balanced difficulty.
