Persistent section cut of intersecting objects. Pull request #7876, Pull request #8266, Pull request #8646 and Pull request #9356. Several new parameters have been added, see the Navigation Cube page for more information. The Mini-cube menu now includes a checkbox to toggle the movability of the cube. Default font selection and sizing has been improved. Borders have been added around the buttons. Corner faces have been made hexagonal and larger so that they are easier to click. The cube is no longer shown in perspective if the 3D view is in orthographic view mode. Users with the old scheme enabled will be warned on startup. The older format ( FCStd#) is deprecated and will be removed in a future version. The default backup file naming scheme is now FCBak. Older FreeCAD release notes can be found in the Feature list. This page lists all new features and changes. So i suppose this is a bug (partial redundant constraints causing breakage).FreeCAD 0.21 was released on 2 August 2023, get it from the Download page. However your project assumes that the arc is a half circle (you used tangency constraints at the 2 points), which isn't always the case. The project you attached is correct indeed, as is my example project with the partial redundancy removed. So this should fully constrain the arc, and as chrisb had pointed out, the issue is caused by partial constraint redundancy, and not lack of constraints. The whole arc is created as external geometry in the 2nd sketch, and the normal arc is created using the external center and 2 points. The arc in the master sketch is defined through center + 2 points (a center with 2 points define exactly an arc, actually 2 complementary arcs). You need here to refer to the center and one end of the 1st arc. You cannot copy an arc with 3 points : an arc is 5 Degrees of Freedom (dof) and 3 points are 6 dof.
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