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
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue under control, following Review a patch or merge request → as a guide.
Thank you for reporting this bug.
As a next step it will need a test case to show the bug.