Supports using interface layer with soluble supports is added every other layer

[slyicep]

Description of the bug

I've been printing supports with the interface using PVA and BVOH and they have been working great with 2.5 and below. I've tried using 2.6 Alpha 3 and the supports alternate layers between the PVA/BVOH and the actual material being printed when generating the supports. I can take the same file and it works fine in 2.5

Project file & How to reproduce

Shape-Sphere.zip

1. Select an MMU2 default Soluble Interface profile for the printer
2. Create a sphere on the build plate
3. Generate supports (I used on build plate only). Not organic supports.
4. Make sure the support material extruder is set properly
5. Slice and see the resulting supports to notice every other layer is using the support material.

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.6 alpha3

Operating system

Windows 10

Printer model

MK3S+

[rtyr]

Reproduced. Thanks. It looks like the layers are actually printed twice with both tools.

[bubnikv]

Fixed with 52c70cf2bae66be7205a872e1c744811f2ac0439
Thanks for the report.