It's the same issue as the beta https://forum.affinity.serif.com/index.php?/topic/76752-photoshop-export-hidden-layers-are-empty-in-psd/
1. Whenever I tried to export hidden layers, they become blank (as in the image gets replaced by a blank pixel data).
I'd like to also add that
2. exporting also deletes the empty folders which are important for some program parsing of data (which I think has something to do with the #3)
3. I noticed that file size doesn't change whether Don't Export Hidden Layers by Export Persona is toggled on or off (Just pointing out, maybe this is related to the bug)