Using the sketch offset tool, the default value pre-filled in the dialog box is 1.00mm. If the user accepts this pre-filled value by pressing enter or clicking OK, the offset value isn't actually 1.00mm, more like 1.0000001. This can be seen by then using the inspect tool with 8 decimal points of precision selected. I understand the error is small, but this could be unknowingly amplified further in the design through scaling or other methods.
I've seen this error if you just accept the size rather than typing it in. I've seen it in the past using snap to grid as well so always turn that off and type sizes in.
In your example I see the same problem if you just accept the 1.00mm then edit the sketch it will be out by a very small unmeasurable size in the real world.
But if you actually type 1 it comes out correct. This has been reported in the past but I guess bigger bugs to fix first.
This is what I get after typing in 1.
Mark Hughes
Owner, Hughes Tooling
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