Created attachment 643280 [details]
localc-graph-factory.png
This is weird.
I seem unable to reproduce it on Factory (see the added attachment).
Maybe it is caused because some of the packages on 13.2 are too old/buggy wrt
the calc behaviour. And the upstream package uses bundled more up-to-date
version so it works for them...
I guess I could not convince you to try to install tumbleweed into some
virtualmachine to check it yourself?