Dowel connector hole often disappears after one of the resultant objects is cut with a dovetail cut

[gerusz]

Description of the bug

I have sliced up a large dragon model into body parts that I am planning to connect with 3x1 magnets after printing for easier transport. I have used the dowel connector to simulate the magnets (I just don't print those dowels). The model also uses a number of other connectors: actual dowels to connect two parts of the torso, and a pin to connect the tip and the root of the tail.

But still, printing the wings in one piece requires an ungodly amount of supports, so I cut them in two using a dovetail cut to help me get their positioning right for gluing them together. (The wings themselves are too thin for any of the connectors.)

This caused the magnet holes from the wing roots to disappear which is clearly unexpected behavior. The magnet holes on the back of the dragon, OTOH, remained, alongside the connectors themselves.

A planar cut does not cause this issue.

Issue successfully reproduced on a simple box.

Project file & How to reproduce

Project files:

• dovetail_cut_bug_reproduced.zip - a simple file containing a box that was first split with dowels, then one half was split with dovetail (causing the connector holes to disappear) while the other was split with a simple planar cut (the holes remained in the right place).
• frostfang_magnetic_chop.zip - the original file. Please, only laugh at my stupid noobish mistakes in private.

Reproduction steps:

1. Cut an object using a planar cut with dowel connectors.
2. Cut one of the resultant objects with a dovetail cut.
3. The connector in the resultant object will go to a seemingly random location. Sometimes it is the correct location, sometimes it is deep inside the object, sometimes it is somewhere outside.

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.7.1+win64

Operating system

Windows 10 (version 10.0.19045.3930)

Printer model

Anycubic Kobra 2 Pro

[YuSanka]

Thanks for your report.
SPE-2185