Tilemap collisions do not work in build.

[nicbiondi]

This issue is thankfully fairly easy to fix by flagging textures used in tilemap with read/write. Wanted to mention it here so that this could possibly be fixed for new users that don't know how to fix this behavior. There are a few threads about this including this one.
https://forum.unity.com/threads/unity-2d-2017-2-0-b10-tile-collider-not-working-on-build.494916/

[ChuanXin-Unity]

Ideally, you would set up a Custom Physics Shape for each Sprite used in a Tile. You can do this through the Sprite Editor or enabling "Generate Physics Shape" in the Texture Importer Inspector.