Roger, I've re-created the situation, here is the 3mf file. The funny bit of support is still there.
GregValiant 1,251
When I change the Support Placement from Everywhere to Touching Buildplate that piece of support goes away and the spot between the right ear and the head is not supported any longer. So it looks to be that Cura is building the support from the build plate up to the root of the right ear and the body is in the way so it starts from the build plate, pauses when it gets to the stomach/chest and continues from the back up to the root of the right ear. That ear area needs support so I think in this case you will have to live with the piece on the build plate. It isn't there for the body but rather for the ear where it connects to the head.
Placing a support blocker at the root of the right ear will also cause the questionable support on the build plate to go away.
In this image I've set placement to Everywhere but added a support blocker at the ear.
Remember when you wrote "Normally the program only does this if the support is required above."?
I thought it might be a case, and it's not doing any harm in this case, but it seems to be erroneous; I thought cura devs might pick it up 😉
GregValiant 1,251
I guess it could be called an artifact or maybe a pre-ifact?
@nallath do you have any thoughts on this?
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GregValiant 1,251
Load the model in Cura and set up the way you think it should slice. Then select "File | Save Project" and post the 3mf file here. A project file is worth a thousand pictures.
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