The problem

There are two particular places with wrong return value types:
1.[FIXED ALREADY] boolean returned instead of integer. shall be return 0 i suppose.

/// Return the number of actions in this action list that are currently running.
  int num_running() {
    if (this->actions_begin_ == nullptr)
      return false;
    return this->actions_begin_->num_running_total();
  }

2. Another questionable place where function add_action returns nothing instead of the pointer

template<typename... Ts> class Automation {
...
Action<Ts...> *add_action(Action<Ts...> *action) { this->actions_.add_action(action); }

Which version of ESPHome has the issue?

2023.12.xx

What type of installation are you using?

Home Assistant Add-on

Which version of Home Assistant has the issue?

No response

What platform are you using?

ESP32

Board

No response

Component causing the issue

No response

Example YAML snippet

n/a

Anything in the logs that might be useful for us?

n/a

Additional information

No response