This happened to me back in 2015:
Me: Due to my injury I need to restrict movement and be within confined spaces for atleast 3 months. So, I'm planning to take Loss of Pay for 3 months and be at home and recover.
Manager: If you can work I can convince our head of department to allow you to work from home, from your personal laptop.
This happened during the time when remote work was considered taboo and we worked with desktop computers in office. I was so surprised that the manager went over and beyond to get me remote work for 3 months. I worked and I got paid for those 3 months. I didn't even know this option was possible at that time.
The thing is, most green flags are associated with teams & teams only. Not the company. Companies are mostly trying to stay afloat, be profitable, compete and cut costs. So look for green flags in your team. If you begin to look for green flags in your company, I'm most certain you won't find any.