Stroke Cap
Stroke Cap display error. The cap is displayed as a rounded cap even when projecting and butt cap are selected.
All outlines here are closed path, therefore Butt Cap does no affect them — it applies only to open paths.
All outer points in these are smooth, therefore Miter Join does not affect them — since there are no corners this setting applies to.
To see sharp corners here you’d need to modify the outlines to actually have sharp corners, for the stroke to follow.
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This is not an error. This font has no sharp points that can make the difference, all points (except for inner connections which do not contribute here) are smooth.
Take a look at this image: the path on the left has sharp outer points, the path on the right does not — but both have the Miter Join selected. There are just no CORNERS in the second path, that is sharp connections, the font is smoothed out originally.