With "Contact Z distance" set to 0, bottom layer of support material is missing

[BManx2000]

Version

1.34.1

Operating system type + version

Tested on Windows and Mac

Behavior

When "Contact Z distance" is set to 0, the bottom layer of the support material is missing. This doesn't happen on all models, I have included a test model that causes the bug.

• Expected Results (screenshot with nonzero contact distance)
  

• Actual Results (screenshot with zero contact distance)
  

STL/Config (.ZIP) where problem occurs

support.zip

[bubnikv]

This bug has been fixed with 46e8259
and it will be part of the beta to be released today: Slic3r-1.34.1.24

Also please note that we have changed the support interface pattern from zig-zag to concentric for soluble supports with the Slic3r-1.34.1.24 release.