[Bug] Update(visible=False) has no effect for a tab within a TabGroup

Type of Issues (Enhancement, Error, Bug, Question)

Bug

Operating System

Manjaro XFCE, Windows 10

Python version

3.7.4

PySimpleGUI Port and Version

tkinter '4.4.1 Released'

Your Experience Levels In Months or Years

2 years Python programming experience
10+ years programming experience overall
No, I have not used another Python GUI Framework (tkinter, Qt, etc) previously?

You have completed these steps:

• [ Yes] Read instructions on how to file an Issue
• [ Yes] Searched through main docs http://www.PySimpleGUI.org for your problem
• [ Yes] Searched through the readme for your specific port if not PySimpleGUI (Qt, WX, Remi)
• [ Yes] Looked for Demo Programs that are similar to your goal http://www.PySimpleGUI.com
• [ Yes] Note that there are also Demo Programs under each port on GitHub
• [ Yes] Run your program outside of your debugger (from a command line)
• [ Yes] Searched through Issues (open and closed) to see if already reported

Code or partial code causing the problem

visible=False has no effect on Tabs within TabGroups, neither in layout, nor on update of such tabs.
In contrast, disabled=False works as expected.

The issue mentions TabGroup tabs and the visible=False update behavior, but provides no source file, test, or complete reproducer. Start by reproducing the layout and update cases described, then trace the TabGroup implementation and compare it with the reported disabled=False behavior. Done means visibility works both when initially declared and when changed through update().