In Germany, you can receive partial disability benefits ("Erwerbsminderungsrente"); that is, you might be evaluated as being capable of 3-6 hours of work per day, and thus receive only a portion of what would have been your full disability payment. Also, it's accepted (even hoped) that you might become fully fit again.

https://www.deutsche-rentenversicherung.de/DRV/EN/Leistungen... (under "Invalidity pension")

More details in German: https://www.deutsche-rentenversicherung.de/DRV/DE/Rente/Allg...