The Editor module tracks when an editor has modified a field, and reverts the value of a field when its editor has not made any changes. When editing HTML source in CKEditor, the "change" event is not fired and the field is not flagged as having been changed, which will cause the field to be reverted in some conditions.
Using a solution similar to what is outlined at https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_editor.html#even..., add code to behave similarly to the change event handler.
Develop and test.
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Needs work
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I am facing same issue with CKEditor Source mode with Site studio.
@ashwinsh #16
Don't know if you have found it but on this page https://sitestudiodocs.acquia.com/8.0/user-guide/version-800-release-det...
It says it is a known issue and to apply a patch.
It does link to it on there.
Hope this helps anyone else with the issue when using Site Studio.
It worked for me.