I salvaged about 15 legendaries during the server slam and didnt get a single Abstruse Signal, Coiling Ward or Baleful Fragment. 
Is this a well known bug or working as intended?
I cant find anything official about this.
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Probably intended or item level related.
Where they crafted legendary´s from Aspects or normal drops ?
In D3 some of the crafted legendarys did not return a Forgotten soul when salvaged.
At least 10 were a mix of drops and gambled legendaries.
This was not a problem in the first beta.
I got a total of 186 Abstruse Signal, Coiling Ward or Baleful Fragments in the first beta.
Item level matters. 
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Yeah I thought that too, but I salvaged at least one level 22 item in the server slam and several well below level 25 in previous betas that gave those materials.
So I dont think its either the item or req level.
Then I am not sure either! xD