Train Tracks: Who Needs Partial Refunds, Anyways?

Notice how the station module plans to return 80% of its construction cost, as per my Partial Refunds difficulty setting, but the tracks are offering a full refund anyways? (Build costs displayed via copy tool, demolition returns via demolition tool)

Worth note: This is specific to straight, flat rails, which cost only 1 Rail Parts and 1 Gravel per segment on Standard costs. Elevated also affected. The curves and slopes, however, correctly return less than they cost. On a previous world, where I had doubled construction costs in the difficulty settings, this issue did not arise at all- all tracks correctly returned less than their cost.

Update 4.2 | v0.8.6c (b612)

Reproduction (it's very specific):

1. In Difficulty Settings, have:
   1. "Construction Costs" set to "Standard". Other settings may or may not be affected. "100% Increased" known clean.
   2. "Deconstruction Refund" set to "Partial Refund".
2. Have some straight, flat train tracks somewhere. Can be elevated.
3. Note the construction costs. Use copy tool if needed.
4. Note the returns shown by the Demolition tool. They will be identical.