is this as bad as I fear it is

[Robert Grant]

I got home with my new rebuilt 24AEP4 (I have a set that uses one), and checked condition of the neck, and saw this scary trace of white just inside the plastic neck cap, which I didn't remember seeing when I first saw the tube
I know that white on the inside of a tube is a sign it has gone to air- but other tubes I've seen that have gone to air are full of white

I also mention that this tube was perfectly snug in its box, with no "wiggle room" at all. Nothing could have possibly struck the neck

Please tell me that this little bit of white could be normal.