When the space-age mod is active, the Big Accumulator's recipe and technology both require Fulgoran resources. As such, Big Accumulators are most optimally built on Fulgora. However, the item has no default_import_location set, meaning it defaults to Nauvis. As a result, Space Platforms won't auto-request it from ground logistics. I recommend including
data.raw.item["kr-big-accumulator"].default_import_location = "fulgora"
In data_updates.lua, since you already have a check for space-age there.
