You mean that you select the placed PDF page, go to the Drawing Selection Settings Dialog and in the Properties panel the Color field doesn't show you this setting, the Original Colors option?
It works for just fine.
Can you try to start a brand new project and see if it is available there?
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I did what you suggested in a new project and it worked (Original Colors option was available) i was also able to copy and paste it into my original project that was only giving me greyscale as an option. After that new .pdf that I import are in color so it seem to have fixed it somehow although now the greyscale option is not available.