Tabs of Tabpanel invisible if container added

We add containers to tab panels usually with top = 0 passed for ContainerControl.EmbedWithinPanel.

Works for Mac and 2017r3 and older.
But in Xojo 2018, things are broken.

See feedback case: <>

anyone else sees this?

@Christian Schmitz

Did you manage to find a solution to this? I have a similar issue reported here :

Nope, they have been working fine for me.