Opponents start even if they shouldn't

[Novatlan]

Hi!

I play TTD (and now Open TTD) without a.i. opponents. In Original TTD this worked fine, but now in Open TTD the opponents always start even if I deactivated them before in the ingame settings.
Is there a solution to this problem? Or is it normal?
If it is normal, may I ask to reintroduce this function, because i love building without being pressured by the a.i.

Novatlan