Didn't notice it amongst the jumble of data being displayed. So are you thinking that this tooltip should not be coloring the data contained in the pointer? I mean, I wouldn't expect it to, just like it doesn't color the text between quotes. So I would definitely call this a bug.
It seems to occur with all string type debug tooltips containing long data.
As you can see in the shot, the problem starts after the first line break. So it may be related to this. Maybe VAX looses its scope through the line break.