In light of the fix, I’ve looked further at the remaining problems with “object reference” not set on my server side services and worked out that the issues are of my own making. By and large I had been using several “class property” references where I should have been using “class var”.
I’m happy the specific bug reported has been fixed. I do have issues in client side code with object reference not set as per my previous message, but I will open a separate thread if necessary.