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It is a mistake to extend NodeAction and override enable() to always return true. The NodeAction is expensive as it listens to changes of activated nodes. Maybe we do not need to extend SystemAction in Bookmarks module at all to avoid too many classes here - Next/Prev/Toggle.
I plan to use regular editor actions for the bookmarks actions. I just could not do that yet as the editor did not allow to register actions from external modules but it's planned to be implemented.
The change is not yet performed and not sure whether we'll fix it for 6.0.
*** This issue has been marked as a duplicate of 85442 ***