Simply by explorting frames as slides with Deck, the custom fonts we use (and I assume others do the same) are converter to PPT correctly, but their naming breaks some of the styling and further editing.
We had to manually rename "Kontora Regular" to "Kontora" to make sure styling and positions of text are same as in Figma and to embed the fonts in the PPT file.
Problem is doing this manually is painful - since PPT doesnt allow bulk edit.
Perhaps either this is a bug, or this could lead to a feature, which would allow bulk editing of fonts in Deck right before exporting?