If you manually enter ?action=edit to a collaboration hub or collaboration list, avoiding the use of the specialized editing interfaces, you get a regular wikitext editing interface. Since these content models are JSON behind the scenes, you should get the JSON editing interface instead to prevent/mitigate malformed JSON.
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Change 293544 had a related patch set uploaded (by Brian Wolff):
Make ?action=edit so Json editor if WikiEditor CodeEditor ext is on.
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Change 293544 merged by jenkins-bot:
Make ?action=edit so Json editor if WikiEditor CodeEditor ext is on.