When opening up a designer, all tables look like expanded, but in fact are collapsed, so it takes two clicks to actually expand them (first one just changes the icon, while second one does the expadning). Afterwards expading works as expected, so just the initial state is wrong.
I will like to fix this bug,
if it is not assigned to some other person .
bug fixed and the patch added (rfe: 2987900 )
This bug was fixed in repository and will be part of a future release; thanks for reporting.