Using FontCreator 13.0.0.2648
Before Cut
After Paste
Paste special with colour and overrule same codepoints. The glyph is a single colour glyph and has no other colour glyph members.
After Copy Paste
Paste special with colour and overrule same codepoints.
I see. It is more complex than we expected, so it might not always be possible to correctly cut-copy-paste, as it depends on the internal structure of the font, and that could have changed.
We have just fixed one issue related to copy-and-paste of color outlines, but that is not helping with cut-and-paste.
For color outlines, with both cut and copy we copy the glyph index of the color glyph members to clipboard. A cut will change the glyph index of all glyphs after the cut glyph(s), so that will cause issues. If we use glyph names, one could change a glyph name between cut and paste, so even that is not guaranteed to work, but might be better. The next upcoming update will use that, so we can see if that helps.
Here is another update with the suggested change. Let us know if this works.
https://www.high-logic.com/tmp/fontcreator/FontCreatorSetup13.0.0.2650-x64.exe
Copy and Cut / Paste seem to work as expected as long as one selects Both Color and Outlines on the paste special dialog.
That is because the color glyph member uses its own monochrome outline.