(Max, an idea: Could you, maybe, create a sticky Bugs thread for reporting possible bugs with the exporter tool?)
One thing I have always wondered about: In some older maps (e.g. TheIsland2 2016), the directional light can cast realtime shadows. (Curiously, you can see your own only in 3rd Person view mode). This does not seem to be possible anymore nowadays?!
What I am thinking of doing is this (see Page 8): https://media.contentapi.ea.com/content/dam/eacom/frostbite/files/gdc2018-precomputedgiobalilluminationinfrostbite.pdf
Basically, have baked indirect lighting + light probes and direct lighting from a directional light for sun light + realtime shadows.