Slice Outline fails with small slices

[cat]

The small slices in my map, are outlined, in the input map, but are missing on the output, just adding the small slices to the outline slice, and they are still missing, even when increasing the line width

They do render with content in.
They are 384x32 and 192x48

[Zoltán]

Bunch of different resolutions there,

What's the resolution of the slice outline source?