[BUGFIX] Keep raw data alive for use in FLUID templates

Change-Id: If5199959f516aae3f8332327c04f5321e12d7b2a
Resolves: #60099
Reviewed-on: https://review.typo3.org/31639
Reviewed-by: Jo Hasenau <info@cybercraft.de>
Tested-by: Jo Hasenau <info@cybercraft.de>