I think putting a small text notice for the user that it may not work best with Space Age would be sufficient enough, that way the user won't expect everything to work flawlessly, as usually the case for most things in Factorio.

Thank you for the quick reply.
I appreciate the insight into how tile transitions work and understand that addressing this issue would require reworking the tile transition system significantly.
I can see how focusing on other aspects of the DLC might take priority, especially since transitions to ...

1. What did you do?

Recently been playing the "Ribbon world" map preset where map height is limited to only 128 tiles,
first planet I landed on was Vulcanus .

2. What happened?

I noticed that there was only coal available in the starting area.

3. What did you expect to happen instead?

I ...

1. What did you do?

Recently been playing the "Ribbon world" map preset where map height is limited to only 128 tiles,
first planet I landed on was Vulcanus , where I started placing bricks along the edge of the map.

2. What happened?

I noticed that there was a brown edge to the bricks.

3 ...