(bug) FilletSrf on extrusion - wrong side

2 simple boxes are stacked on top of each other.
_filletSrf gives me the wrong side:

filletSrf_wrongSide.3dm (3.0 MB)

after _convertExtrusion the behaviour is as expected

Version 8  (8.28.26041.11002, 2026-02-10) on mac intel

@menno thanks for having a look - kind regards -tom

@Tom_P I think you uploaded the wrong file

fixed - thanks

This is fixed in FilletSrf in Rhino WIP, you posted this before:

ok - its part of a exercise i do once per year…
and - i do not have easy access to a mac silicon / intel only, so i gave up WIP testing ;-(

You can still run the WIP on the Windows side.