When you check a field to be rendered raw, it will not be available as replacement pattern for upcoming fields.
Create a new node view as REST export.
Add the node title as field.
Under "Format" -> "Show: fields" -> "Settings" check the "Raw output".
Add a "Global: custom text" and use the {{ title }} replacement pattern in it.
You would expect to see the title twice in the results.
But you will only see it once, second field will be empty.
Call "postRender" on the field even when using raw output in order to populate it's "last_render" attribute.
Thus the value is available also when this is retrieved from cache.
Review the patch
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Needs work
9.5
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