Problem adding a performance to a show

When adding a new show, there’s the already documented problem with recent stageshow version, that a new seating plan does not links to a tariffplan. So making it impossible to add a new seating or pricing layout.
I experienced another odd bug: when a new show is added and I try to add performances, only the first performance gets listed correctly. The second one, does not take into account the seating plan, resulting in not showing the correct number of available seats and a bigger problem: not showing up in the box office.
This is a major problem, because the audience cannot purchase tickets for upcoming performances.