[QGIS-Developer] Rule based layer styling without rules misbehaving?

[Richard Duivenvoorde]

Need to have a styling to have two icon sizes

 From 
https://gis.stackexchange.com/questions/172775/is-there-a-way-to-change-symbol-size-units-dependent-on-scale 
I concluded that creating 2 rules would be easiest...

But: creating a rule (without a filter, embedded svg icon), setting 
min/max scale and then copy/paste that rule, change symbol and try to 
set min/max scale again makes symbols disappear (or it looks like the 
settings are also set on another rule...)

Have others seen this?
Has it something to do with the fact that there is no filter set?

Regards,

Richard Duivenvoorde