When I snap line end points to other curves, they occasionally disappear, effectively deleting the end points. This happens when invoking the node tool from within the pen tool as well as in the stand alone node tool.
Here's an example:
2022-11-24 23-28-36.mp4
In this particular instance, it also happens when snaps are disable, so the cause might be elsewhere:
2022-11-24 23-31-08.mp4
I tried reproducing this in a clean file, but then it won't happen, at least not the way I tested it. Not even on 16000X zoom level.