AFAIK that's intentional. The don't spawn missions now for stuff you have in your cargo hold. The idea is you take the missions first, then go get what is required.
As others already stated, this is a myth and I can confirm this by my yesterday's experience. Finally, I've had time (and the mood) to gather the Bromellite gift for Mr. Turner and I could instantly fulfill three missions with "by-products" I had in my hold.
As a side note regarding ice mining: It might not pay well, but it is sooooo beautiful - especially in VR!
The 'roids look so much more interesting than the metallic ones! I dropped at the "side" of the gas giant and worked my way up "towards the light" (the ice ring was quite dusty), the planet's enormous, bright sickle always to my right (barely visible due to the dust). The subsurface scattering works great with the small and defined asteroid bodies (way better than with ice planet surfaces).
My favorite, calm music rounded the experience and I had such a great time (actually 1 1/2 times) in this icy ring! I'll definitely repeat this, when in the right mood again.
Anyway, what did I want to say? Oh yes: there is more than making money in this game.
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