Hi Brian,
Thanks for contacting Syncfusion support.
Query #1: Tab header disappears in advance
We have checked the above query and as per the current Tab architecture the header disposed in advance. So, we considered your requirement as improvement and logged the feature request and you can track the status of this feature from the below link.
We will implement your request in our Volume 3, 2020 main release.
Query #2: Inplace editor value changes without any manual modification
We have validated the reported query and have considered this “Inplace-editor value is changed dynamically, when the editor is opened/closed” as a bug from our end and the fix will be included with our Volume 2 SP1 release.
Regards
Alagumeena.K