Your description doesn’t make much sense to me, but let me try to explain:
Specific Viewport will show a list of viewports that are in the document, but not Named Views.
When I have a viewport called
Bla, and I set it as the
Specific Viewport, then make
Top the active one using
_RenderPreview the correct viewport is being rendered:
Bla. This all works as expected.
Now, if you have Specific Viewport set to
Bla, then rename the viewport to
BlaBla, then make
Top the active one, then
_RenderPreview will render
Top, unless you first ensure the
Specific Viewport is set to
BlaBla - the list isn’t immediately updated, but activating a different panel, then going back to Rendering panel will give you the updated list after which you should be able to set to
This last part is what the bug report is about.
Anyway, if you want to render what the current active viewport is then you need to set
View section to
Current viewport, not