I'm facing some issues with the RTE inside a multifield and this inside a tab.
The toolbar isn't positioned properly as soon the textfield is focused (see image below)
This issue was on AEM version 6.4.2 and 6.5.2.
My workaround was to change the tab component to coral2 and style this component to make it look good again.
Is this issue already known or can be solved without my workaround.