Windows Greenhouse shadow prevents tilling

The Greenhouse has a shadow on its left side that no other buildings have.

This shadow can be placed over tilled land, but the land cannot be tilled on that shadow. The shadow doesn't affect placement next to anything, it simply prevents tilling.

This effectively makes the greenhouse's size 8x6 instead of 7x6 when it comes to tilled land.
The shadows of the rest of the buildings appear in front of them, and do not affect tilling.

This has been an issue since 1.5.
 
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