compound state with an initial state and an automatic transition to another child state will activate both states

[HymnStudio]

Here I use the example scene in performance_test, add a transition node to Root compound state, which is an automatic transition to StateB with no delay time and guard.

By doing so, a compound state can have its two child both active at the same time:

I am not sure if it is intended, but here is my understanding: when entering compound state,1. it first calls the base state _state_enter() method, triggering the automatic transiton to active StateB，2. then it calls its _state_enter() method, activating StateA according to its initial state setting:

[derkork]

Thanks a lot for reporting this! This definitely looks wrong. A compound state should under no circumstances have more than one child state active at any given time. So i think the correct flow should be

• Enter Root
• Transition fires
• Enter B

So an immediate transition will supersede any initial state (which is the idea behind this expect_transition flag, but it obviously is not properly set here). I will do a bit of investigation as such setups may lead to very interesting edge cases and I'll probably also need to update the manual to describe the behaviour that can be expected.

[derkork]

I found another edge case if the transition leaves for a totally different state. Then the initial state is entered but never exited. Fixed this as well.