[0.15.10] tile removal leaves ugly pattern

[dasiro]

after removing concrete, there's a distinct pattern that remains instead of the original terrain. I Don't know if it's supposed to dissapear after time, or just remain as a legacy of former tiling ?
under my char there's the pattern, above is pristine terrain

[Loewchen]

This behaviour is very old but we never could reproduce it.
Can you provide a save with: Normal surface > placing concrete > removing concrete > abnormal surface?

[Rseding91]

Removing tiles 1 at a time is ends up with this pattern as it is now. That may change in the future but that's currently working as intended.

[dasiro]

This behaviour is very old but we never could reproduce it.
Can you provide a save with: Normal surface > placing concrete > removing concrete > abnormal surface?

although rseding already stated it is intended behavious, it's quite easy to reproduce.
in this save, just place the blueprint, wait for it to be constructed and then remove it with the deconstruct in slot 5 (twice: once for rails, second time for tiles)