So from what I have experienced at least it seems that two thing keep happening with legendary engrams with each up-date.
-They appear less and less frequently (ever since the loot cave update)
-When they do appear they seem to spawn more and more ascendant materials than previous patches.
I have actually gotten about 7 legendary engrams sense the last patch and all of them have turned into ascendant materials.
I know that it is RNG, but It seriously think that Bungie is weighing ascendant materials more and more lately.
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My last 12 legendary engrams have been turned into materials,i wouldn't mind but surely i should get energy from weapon engrams -not shards. I currently have 1100 shards (and counting ) 30 energy. Not sure if the R in RNG stands for Random or Rigged.