For this to work, we have to take into account handles in TransVert as well. Behavior is the same as in legacy curves (meaning that if the control point itself is selected, the handles are ignores). Part of #133448 (same thing for grease pencil, which I plan to also make part of TransVert, but better solve for Curves first, so we can share code here). Pull Request: https://projects.blender.org/blender/blender/pulls/134945