I think measurements being blocked bug has not been addressed yet. Adding a default Markups node to scene removes measurements · Issue #7239 · Slicer/Slicer · GitHub
Also, try creating a pointlist with 3-4 points. Delete the node, recover, and repeat the operation a few times (undo/redo), notice that one by one the points start to disappear from the list.
I also noticed a case where the node was removed from the scene by right click delete scene and yet the points remained visible in the 3D viewer. I can’t remember the sequence this was generated from. I will try to replicate…
But it is such a critical features, I think we should harden and incorporate into the core, as opposed to keeping at a snippet.