Merge Model only works with Single 1
Don't know maybe a bug but when I try to merge a model and print it with the right extruder (Single 2) it could't be sliced. Without merging, all parts could be printed with extruder right but merged it doesn't work.
In Single 1 mode / left extruder it would work with the merged model. At the moment I print left extruder TPU and right extruder PETG. Now I have to put PETG to the left 🙁
Mac with Stratos 1.5
Here have a look. After merging two parts it is not possible to select extruder 2 🙁