@Jusey1 I apologize for my misunderstanding, and thank you for clarifying the details. I think I can make a bit of comparative use of my first screenshots, though, as a slight consolation.
I can confirm what you're saying in my game as well. I normally only placement-test on those lots, and do not build there (due to poor lighting for gallery thumbnails), so this is likely why I never noticed. So...
In this screenshot, taken on the lot "Fern Park" in Newcrest, you can see that the terrain paint does not go to the edge:
And in in the screenshots below I use a game stone tile and it does not go to the edge:
Please note that this is referring to the following area in Newcrest:And as you previously stated, the one lot in this area that does not show the issue is Oak Alcove, which I can confirm in my game also.
Edit: Oops... I highlighted the incorrect lot here originally (sorry, thank you for pointing that out, @Jusey1 ),the one lot in this area that does not show the issue is Comfy Cove", which I can confirm in my game also.
With this in mind, if you would like to create a Bug Report on the issue, then post a reply here to let me know you created it, I can see if this post could be merged into the bug report to provide additional information/confirmation, plus I could "Me Too" the report.
Bug Reports can be created here: https://answers.ea.com/t5/Bug-Reports/bd-p/The-Sims-4-Bugs
