Confirmed, the addon crashes Blender after drawing annotation lines and pressing the "Add Surfaces" button.
Bsurface 1.8.3 crash Blender 4.3.2
Super useful
a must have
One of the must have for modelers in Blender. If you don't know what this Add-on for! just search it on YouTube.
In blender 4.3 when you have installed the BsurfacesGNU addon with Modern primitives addon Blender crashes.