How do I stop Studio from removing surfaces between parts?

I added full instructions here:

Really?

When you click the link to the other post (Guide: Raised Text on 3D Prints Without Top Surface Defects), you can’t see the pictures? That is strange, I can see them and I tried a few other devices without being logged in.

To make #5 less confusing:

1: Mention to raise the sketch to the top of the outline before extruding.

2: Include a section view so it’s obvious we’re creating hollow text

This doesn’t work with ironing enabled.

Actually this method just doesn’t work anymore. Just prints floating text

I’m having essentially the same issue with raised text and a concentric top surface.

I’m using a 0.6 mm nozzle and 0.3 mm layer height. I need the layer directly below the raised text to remain a completely uninterrupted concentric surface, with the text starting only on the following layer.

I’ve tried Classic wall generator, disabling “Only one wall on top surfaces”, modifiers, splitting the model at that Z height, and even importing the base and upper section as a single object with multiple parts. Bambu Studio still modifies the concentric paths on the layer below the text and creates separate regions around the character outlines.

Has anyone found a reliable way to force that layer to be treated as one continuous top surface before the raised text is printed?