I found some similar topics, but I figured this was different enough to warrant its own topic.
So I’m about 1 month in, and for the most part, I’ve had no goblin spawns. The problem occurs when the fog of war gets pushed back, and what appears to be all the goblins that should have spawned flood in at once. My last spawn was around day 8 - there are over 30 goblins in the screenshot, and they weren’t even finished coming when I took it.
Save file below; the issue consistently reproduces when designating the rocks in the screenshot for harvesting, but it doesn’t happen every time though, so it may take a couple of tries.