In previous versions, if you import multiple parts files, the Prusa Slicer asks if you want to convert to various objects or keep an object with multiple parts. On the 2.8.1 version, it doesn't ask and, if the other parts are internal, it joins all the parts in one single object after slicing.
After some time trying to reproduce a previous file made in another version, I tried to push the "P" button ("split to parts") on the main toolbar, and it works, but I think very few people will think this way since none of the other parts previously shown on the object list.
Also, after splitting into parts, they do not receive a perimeter (or it is not properly shown in the slice view), if the internal parts were configured (by part) to 2 perimeters.
Project file & How to reproduce
Any file where you can export it with other objects inside a bigger one. For example: a smaller box and a sphere inside a bigger box. Export to STL and import it into PrusaSlicer. You will see just one object on the object list as so after slicing (1).
If you split into parts, you will see all the objects, but the slicing will keep all joined (2) until you address different infills (3).
There will not be any perimeter inside until you specify one for each object, but if you want 2 perimeters, it will not appear. Only below or above this number (4).
Description of the bug
In previous versions, if you import multiple parts files, the Prusa Slicer asks if you want to convert to various objects or keep an object with multiple parts. On the 2.8.1 version, it doesn't ask and, if the other parts are internal, it joins all the parts in one single object after slicing.
After some time trying to reproduce a previous file made in another version, I tried to push the "P" button ("split to parts") on the main toolbar, and it works, but I think very few people will think this way since none of the other parts previously shown on the object list.
Also, after splitting into parts, they do not receive a perimeter (or it is not properly shown in the slice view), if the internal parts were configured (by part) to 2 perimeters.
Project file & How to reproduce
Any file where you can export it with other objects inside a bigger one. For example: a smaller box and a sphere inside a bigger box. Export to STL and import it into PrusaSlicer. You will see just one object on the object list as so after slicing (1). If you split into parts, you will see all the objects, but the slicing will keep all joined (2) until you address different infills (3). There will not be any perimeter inside until you specify one for each object, but if you want 2 perimeters, it will not appear. Only below or above this number (4).
Checklist of files included above
Version of PrusaSlicer
2.8.1
Operating system
windows 11 (26100.2454)
Printer model
MK3s