Open, Hollow Objects Bases not slicing

[Batcastle]

Describe the bug When an open solid (such as a bucket, or a hollow cube with one side missing) is sliced, if the side opposite the face that is missing is parallel to the print bed, it does not appear in the slicing preview or in printed models.

To Reproduce Steps to reproduce the behavior:

1. Take an open solid, such as a bucket or flower pot
2. Load it into Slic3r, with the open end pointed up or down
3. Preview the print or Export the Gcode and attempt a print

3D Model and Slic3r Configuration Export Configuration I used: https://pastebin.com/bWKBTPXY

The STL Files I used: Cylinder: https://github.com/Batcastle/Batcastle/blob/master/Ultra%20Basic-1.stl Cube: https://github.com/Batcastle/Batcastle/blob/master/Basic%20Cube.stl

I tried this with multiple levels of infill and got the same results

Expected behavior All sides sliced properly, regardless of orientation.

Screenshots Cylinder: https://pasteboard.co/K5iRFxp.png Cube: https://pasteboard.co/K5iSba1.png

Desktop (please complete the following information):

• OS: Linux (Ubuntu 20.04-based)
• Version 1.3.0, also observed on 1.3.1-dev, commit 8c69278

Additional context The walls of the objects I am trying to slice are all 3mm thick. I observed this with 5 mm thick as well. Have not tested with thicker. If the model is oriented with the open end perpendicular to the print bed, this issue does not manifest. No errors appear to be printed to the command line, and I have no idea where logs are stored, if any are made so I have not checked any of those.

Thanks for the help!

[DeeDeeRanged]

Cura and prusa-slicer don't seems to have this issue I found out. Using slic3r I get solid base plates instead of hollow or cut out. Running Debian testing/bookworm.