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I've filed this against Leap 15.0, but that's surely wrong.  It's a problem
with opensuse infrastructure.

We have seen a number of threads in opensuse forums, where a user has updated
his Leap system, and found that he now was running Tumbleweed.  No doubt this
is a user error, but it seems too easy to make this mistake.

Here's a recent post on the topic:

https://forums.opensuse.org/showthread.php/535373-LEAP-15-updates?p=2898194#post2898194

The most significant part:

"I was the only one using the machine and just moving minor items to the
various apps and I added one app ��� KSudoku. I didn���t check ��� I just did the
Direct Install. When you go to SUSE Software and search for KSudodu ��� The one
that comes up is for Tumbleweed."

I have checked that.  And, indeed, the "Direct Install" link is for Tumbleweed.
What then causes the problem, is that this adds the Tumbleweed repo and leaves
it enabled.  So the next update will update software on this system to the
Tumbleweed level.

If the "one click install" could somehow disable the added repo after
installing, that would much reduce the risk.

Reproducible: Always