1. Illegal to fire someone on leave, no exceptions.

2. Healthcare related leaves (employee paychecks for the time) are partially (eg 80% or everything over 3 days or whatever the country codifies) covered by the government.

3. Shaming the employer who now has a hard time to find workforce.

I thought this was the norm outside of USA.
And something that employers still exploit via 'consensual termination', which usually involves some kind of extra compensation, but it's not regulated per se, just wherever a person in power is able to get the other one to agree to. Still better than no protections or warnings I guess.

Oh, reev already pointed out that that practice is against the law as it is now. But healthcare shouldn't be tied to your employer/employment status.