Hey this doesn't seem to be an issue? The entity look up should only work for objects, locations (like scenery) and NPCs. On mobile it would require a long tap to bring up the guide or wiki options for the diaries and quests, on the specific diary / quest.
The past couple of days I have been working on diaries and quests, and I was able to tap the entity lookup followed by tapping a quest in the quest guide, or any diary set in the diary page. Now this is no longer working.
That may be a RuneLite plugin if you've been using desktop? As we didn't implement that functionality.
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