Rectangular pattern constraint is lost when applying a fillet to the sketch object I'm working on a model in Fusion 360 that has part of the 2d sketch duplicated with the "Rectangular Pattern" tool.  If I try resizing the original object, the duplicates update as expected.  If, however, I try applying a fillet to the object, the pattern constraint is immediately lost and the duplicates don't update.  I'm not seeing any error/warning, but I'm assuming it's running into a similar issue as if you were to delete a line that was part of the duplicated pattern (doing that shows a warning "Deleted geometry is part of a pattern, suppressed the instance or dissolved the pattern.")

Is there a way to alter the object (specifically apply a fillet) and have the duplicates automatically update?  I've done a bit of searching around and I found some suggestions saying that patterns should generally be done on the 3d model instead of the 2d sketch, but in my case I'd like to keep this in the 2d world since there are other sketch pieces that are based on the duplicated portion.

Here is a simplified version of the problem I'm running into:


Start with a simple rectangle





Using the "Rectangular Pattern" tool in the sketch menu, select the rectangle and create a pattern


 


Using the "Fillet" tool in the sketch menu, click on a corner of the original rectangle.  Notice that the "Rectangular Pattern Constraint" icon is no long below the original rectangle.





Finish applying the fillet.  Notice that none of the duplicate rectangles have been updated.
In some CAD packages, this is exactly what I would expect.  Models are constructed by applying operations in a specific order.  The fillet is a separate operation, and is not part of the base rectangle.

The base rectangle is defined.
You pattern the base rectangle.
You define a fillet using the base rectangle as the reference.  The fillet affects only that one rectangle.

OTOH, when you modify the base rectangle all are changed because the base rectangle is defined before the patterning operation.

If you can apply the fillet before the patterning, it may work as you wish.