So a friend of mine soloed up to floor 20 but wanted some help getting through floors 21-30 as they hadn't done it with a group yet. However, when we tried to do matched we weren't able to start at floor 21 immediately because they hadn't full cleared yet.

This is something that should be changed, if a first timer has cleared up to floor 20, they should be able to do fixed with a group that has already full cleared and be able to immediately start at floor 21-30. I don't know why this wasn't implemented at the very beginning.