Something is wrong becasue the 'Chamfer' modifier has had a few upgrades lately and it's pretty sweet. Can you share that original model you showed? I'd like to have a look at it. Without something to inspect, I'm not sure how to help you. The Chamfer modifier works really well so if you are having issues, something else is wrong. We just need to figure out what. A model will help do that.
Rob Holmes

------------------------------------------------------------------------------------------------------------------------------------------
3ds Max (2023-2025), V-Ray 6.2, Ryzen 9 3950-X Processor, DDR 4 128MB, Gigabyte Aorus X570 Master motherboard, Sabrent Rocket NVMe 4.0 M.2 drives, NVidia RTX 4090, Space Pilot Pro, Windows 11 Pro x64, Tri-Monitor, Cintiq 13HD, Windows 11 x64
------------------------------------------------------------------------------------------------------------------------------------------