[stable31] fix(preview): properly handle encoded content #39015

Job	Run time
changes	8s
php8.4-webdav	55s
php8.1-webdav	51s
php8.3-webdav	1m 12s
php8.2-webdav	1m 11s
files-external-webdav-summary	6s
	4m 23s

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