Hi everyone,
Another user tipped me off about this thread concerning NavLink ID mismatch. An official fix has been committed last month. Here is a direct link to it:
https://github.com/EpicGames/UnrealEngine/commit/59e7bb912b2959d6c455e5727b1072c69cbf61c5
If you build from source, this should fix the issue as we have moved from an incremental int to using a 64-bit city hash for the ID. If you are waiting for a Epic Games Launcher build, it will be included in 5.3.