See attached screenshots. The first one displays tooltip of a var at usage site. The other one at definition site. The former is wrong.

Note that semantic highlighting is correct in this, probably due to fix described in #1000958. I guess you need the same kind of fix applied to tooltips.

abstract class TooltipAbstractVar {
  var aaa: Int = 3
}

class TooltipVar extends TooltipAbstractVar {
  def foo {
    println(aaa)
  }
}