HI
I installed the new joomla version yesturday from 3.9.15 to 3.9.16.
I have noted that the theme settings in my template (JA Company) were not available to select and the colour scheme returned to the default colours.
I had to reinstall my back up to be able to check the colour theme settings. I have tested this theory by updating again and again the theme settings were not available to choose so I have reinstalled a back up and thought I would let you know.