Slate Style is cooked as EDITORONLY in cooked builds

I have a group of graphical assets contained in a custom subclass of FSlateWidgetStyle, with the brushes loaded from a SlateWidgetStyleAsset to allow the assets to be modified without touching code (for design teams to modify). However, while it works in uncooked builds, cooking the game for release presents the following error when the Style is loaded by the Slate code:

[2014.07.11-13.57.40:468][  0]LogLinker:Warning: Unable to load package (../../../UCP/Content/Slate/Styles/DefaultUCPUIResourcesStyle.uasset). Package contains EditorOnly data which is not supported by the current build or vice versa.

Anyone aware of why this is being marked EditorOnly? Adding the containing folder to Always Cook doesn’t seem to affect it.

Hello,

Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes. If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar error, that is not 100% related, could you please submit a new report for it.

Thanks!