In the current build of FreeCAD in R&D the "add grab point to draw a free dimension" tool within the Drawing Dimensioning workbench is not working. The tool acts as though everything is fine, but no point made from that tool is accessible for selection for dimensioning from when using a dimensioning tool. This has worked in the past on other builds.
Tested on a fresh file after encountering on the file I needed it for. Tested on both Chickadee and Kakapo workstations.