Event track doesn't create references

I have a string table referenced from the event track of a sequence. There are several events, that take a structure, which consists only of a string. In the event track, I have set that string to be a reference to a string in my string table.
However, when packaging my game, those strings are replaced with “” in-game. The reference viewer shows no references to or from the string table, though it is referenced (and working) in PIE. Including the folder with the string table in “Additional Asset Directories to Cook” (under Project Settings->Packaging) also does nothing.