Fusion drops sketch elments, edges of chamfers ... when its parametric solver gets messed up

[fabrice.salvaire]

When you change something and Fusion's parametric solver gets messed up, you might lose

• items in sketches
• edges for chamfers
• ...

There is no way to recover them, and everything is lost.

[jeff_strater]

can you supply an example where this happens?  Best would be an initial sketch + the operation that causes this effect to happen.  Thanks.