What kind of feature are you missing? Where do you notice a shortcoming of PTB?

Image user stuck in the infinite CH loop without exit or cancel buttons. State 1 returns state 2 and state 2 returns state 1. This is definitely fault of bot developer, but what user should do in this case?
Note: inproper state of user/chat/_data may also cause problems.

Describe the solution you'd like

I did such hadnler for myself.

async def restart(update: Update, context: CallbackContext, ):
    context.user_data.clear()
    context.chat_data.clear()
    for handler in context.application.handlers[0]:
        if isinstance(handler, ConversationHandler):
            key = (update.effective_chat.id, update.effective_user.id)
            if key in handler._conversations:
                del handler._conversations[key]
    await update.message.reply_text('Success restarted')
    raise ApplicationHandlerStop()  # Will prevent logging, clearing and other

Sure using the private state of handler._conversations[key] is not encouraged but I don't see another solution. I believe any bot should have such command by default just like try / except blocks.
My request - please review my solution and create prebuild handler inside telegram.ext.handlers package.

Describe alternatives you've considered

No response

Additional context

No response