frame -layout-… data.layout vs data.frame_layout

# Support

## Description
Layouts/ContentElements/Default.html
in Version 11
frame-layout-{data.layout}

in Version 12
frame-layout-{data.frame_layout}

[Is your question related to a problem? Please describe.]
I upgrade a Project with a lot of using CE Layout (data.layout) from 11 to 12. This Property (data.layout) is not respected in frame classes in 12. frame-layout- is overridden with data.frame_layout.

Is it possible frame-layout-{data.layout} get back and render frame-layout-{data.frame_layout} to another class.
Perhaps frame-container-{data.frame_layout} is an Option

## Screenshots

[If applicable, add screenshots to help explain your problem.]

Start with Layouts/ContentElements/Default.html and compare the Version 11 and Version 12 handling of data.layout and data.frame_layout. Trace how frame classes are rendered and determine the intended behavior for retaining data.layout while handling data.frame_layout separately. Done means the layout properties produce the expected distinct frame classes after upgrading from Version 11.

Written by the indexing model from the issue text.