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the container grid is not longer rendered after the content of the StandardContentRenderer but is assign as a variable "tx_container_grid" to the record.
this variable is used in a backend template:
<f:format.raw>{tx_container_grid}</f:format.raw>
container shipped the default backend template (again, we has dropped this in EXT:container 3.0)
in v12 and v13 the ContainerPreviewRenderer is no longer used we use PageContentPreviewRendering Event Listener instead of the ContainerPreviewRenderer
the Listener assigns the container grid to tx_container_grid
in v11 the PreviewRenderer is still used but assigns the grid as a variable instead of rendering the grid after the content
background: in v13 the Event Listener "FluidBasedContentPreviewRenderer" was introduced for rendering backend templates and "disables" StandardContentRenderer if a backend template is defined.
in addition with this change you can also render custom stuff in you backend template after the grid, which was not possible before
Fixes: #563