This looks like the same issue as Problems with GoLink - #9 by Denis (down at the bottom of a long thread)
Weird that after 15 years, the first two people see the problem within a short period of time.
Here is the workaround I sent to Denis.
FlowLink.cs (17.9 KB)
( I wasn’t actually able to reproduce the problem with NodeLinkDemo like you were, but since I’ve seen similar behavior once before, I believe you.)