Important: #78336 - Generate preview links with a chash 

See forge#78336

Description 

The preview link configuration has been extended to be able to generate links with a cHash.

Provide the setting useCacheHash = 1 to add a cHash. This is essential for records displayed using Extbase which enforces cHash usage.

TCEMAIN.preview {
	<table name> {
		previewPageId = 123
		useCacheHash = 1
		fieldToParameterMap {
			uid = tx_myext_pi1[showUid]
		}
		additionalGetParameters {
			tx_myext_pi1[special] = HELLO
		}
	}
}
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If useCacheHash = 1 is not set, the no_cache parameter will be added just like before.