BUG: Bridging fails when 2nd process has different layer height

[richgain]

I have been trying to track down why my bridging setting was failing to be used and have managed to reproduce the error.
Process 1 has a layer height of 0.2 mm and needs to bridge over a hole.
Process 2 is used to smooth the top few solid layers by printing with minimal extrusion and a low layer height (aka ironing).

I have discovered that setting the Process 2 layer height to anything different to the Process 1 layer height causes the bridging to be ignored.
Setting the layer heights in the two process to the same value restores the bridging (shown in yellow).

[parallyze]

Would you mind adding a factory file to have a look at this (File -> Save Factory File as...)?

Process 1 has a layer height of 0.2 mm and needs to bridge over a hole.
Process 2 is used to smooth the top few solid layers by printing with minimal extrusion and a low layer height (aka ironing).

3dbenchy using two processes. P1 stops at 36.8mm using 0.2mm layer height, P2 starts at 36.8mm:

www.aunix.de/tmp/s3d/Benchy-Test.factory (4.5 MB, too big to attach to a post and ZIP is only 300k smaller, still too big...)

I have discovered that setting the Process 2 layer height to anything different to the Process 1 layer height causes the bridging to be ignored.
Setting the layer heights in the two process to the same value restores the bridging (shown in yellow).

No matter what layer height I set P2 to, it won't affect the bridging from P1....

[richgain]

Sure. Here you go. The bridging happens on layer 21 when the layer height in Process 2 is 0.200 mm
Try changing the layer height in Process 2 to 0.020 mm and you should find that layer 21 no longer has the correct bridging.

[parallyze]

Try changing the layer height in Process 2 to 0.020 mm and you should find that layer 21 no longer has the correct bridging.

Now that's an interesting one...

This is so far away from the switch at 6.2mm it's really interesting it does affect the bridging at all. Starting from layer height 0.04mm the problem disappears again.