Knife project switches out of vertex selection mode, but wouldnt do this for all participating meshes. Logic in edbm_select_linked_pick would switch the viewcontext multiple times and the meshes selectmode was not in sync then, leading e.g. finding a vertex in 'unified_findnearest' (because last of the meshes selectmode was SCE_SELECT_VERTEX), but then later in 'EDBM_elem_from_selectmode' other meshes selectmode was not matching SCE_SELECT_VERTEX, leading to crash... Reviewers: campbellbarton Maniphest Tasks: T68852 Differential Revision: https://developer.blender.org/D5536