When linking to a view mode page from a non-default (non-current) revision, the view mode page will always default to the current revision, since View Mode Page doesn’t know how to interpret a revision’s base URL. Substituting a revision URL for the node URL in a view mode page pattern will not show the specific revision’s view mode.
/url/to/node, and a view mode page has the /%/custom-display-mode pattern, visit the same pattern for a different revision of the node, such as /node/123/revisions/789/view/custom-display-mode.Needs review
4.0
Miscellaneous
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The patch in #6 could not apply to 4.0.2 because of formatting updates. I've rerolled the patch.
The patch contains an incorrect permission for the display_revision route.
Current patch works with the admin role but for other roles it gives "Access denied" error as the mentioned permission "access all revisions" does not exist, it should be "view all revisions".