Reproduced with Inkscape 0.48+devel r9772 on OS X 10.5.8
Pasting object(s) with a swatch color duplicates the entries in the auto-palette; 'Dupllicate' (Ctrl+D) does not.
Note that both commands (paste, duplicate) are not affected by the preference setting 'Prevent sharing of gradient definitions' (the setting only prevents forking when editing a (shared) gradient on-canvas or in the gradient editor).
Reproduced with Inkscape 0.48+devel r9772 on OS X 10.5.8
Pasting object(s) with a swatch color duplicates the entries in the auto-palette; 'Dupllicate' (Ctrl+D) does not.
Note that both commands (paste, duplicate) are not affected by the preference setting 'Prevent sharing of gradient definitions' (the setting only prevents forking when editing a (shared) gradient on-canvas or in the gradient editor).