Dynamic Symbols and Follow-ups – Mathematica Stack Exchange

Consider

Column[{
  Slider[Dynamic[x]],
Dynamic[x;RandomReal[]],
Dynamic[RandomReal[], TrackedSymbols:> {x}]}]

I expected the two dynamics to update when I move the cursor, but only the first one does. Refresh inside the second Dynamic do not help.

I have the vague feeling of having already seen this before, but for the moment I do not know why the second dynamic is not updating. Can someone help me?