Bugbox when using 'Reset on a sequence while running without optimization

[jklmnn]

When 'Reset is used on a sequence as in the following example:

package Test is

   type U8 is range 0 .. 2 ** 8 - 1 with
      Size => 8;

   type Entr is
      message
         A : U8;
      end message;

   type Entries is sequence of Entr;

   generic
   session Session with
      Initial => Init,
      Final => End_Session
   is
      Entrs : Entries;
   begin
      state Init
      is
      begin
         Entrs'Reset;
      transition
         goto End_Session
      end Init;
      state End_Session is null state;
   end Session;

end Test;

A bugbox is generated if rflx generate is called without optimization:

------------------------------ RecordFlux Bug ------------------------------
RecordFlux 0.6.0-pre
RecordFlux-parser 0.10.0
attrs 21.4.0
icontract 2.6.1
pydantic 1.9.0
pydotplus 2.0.2
ruamel.yaml 0.17.21
z3-solver 4.8.14.0

Optimized: False

Command: /.../RecordFlux/venv/bin/rflx generate test.rflx -d out

Traceback (most recent call last):
  File "/.../RecordFlux/rflx/cli.py", line 201, in main
    args.func(args)
  File "/.../RecordFlux/rflx/cli.py", line 259, in generate
    generator = Generator(
  File "/.../RecordFlux/rflx/generator/generator.py", line 175, in __init__
    self.__generate(model, integration)
  File "/.../RecordFlux/rflx/generator/generator.py", line 250, in __generate
    self.__create_session(s, integration)
  File "/.../RecordFlux/rflx/generator/generator.py", line 261, in __create_session
    session_generator = SessionGenerator(
  File "/.../RecordFlux/rflx/generator/session.py", line 218, in __init__
    self._create()
  File "/.../RecordFlux/rflx/generator/session.py", line 248, in _create
    state_machine = self._create_state_machine()
  File "/.../RecordFlux/rflx/generator/session.py", line 355, in _create_state_machine
    unit += self._create_states(self._session, is_global)
  File "/.../RecordFlux/rflx/generator/session.py", line 729, in _create_states
    actions = [
  File "/.../RecordFlux/rflx/generator/session.py", line 732, in <listcomp>
    for s in self._state_action(
  File "/.../RecordFlux/rflx/generator/session.py", line 1778, in _state_action
    result = self._reset(action, is_global)
  File "/.../RecordFlux/rflx/generator/session.py", line 2957, in _reset
    assert isinstance(reset.type_, rty.Message)
AssertionError

----------------------------------------------------------------------------