?am I missing something with Hyrdosphere and Support?

I socketed Hydrosphere into 4 socketed boots, just to see how it works with my build. I put in Bonechill Support and Hypothermia Support. What I'm questioning is why (when I mouse over the Hydrosphere thumbnail) I only find 1 support effect active.

-With all of the potential support benefits Bonechill and Hypothermia offer, the game only shows-

*Enemies Chilled by this Skill have Cold Damage taken increased by Chill Effect*

When I socket Faster Casting Support with Hydrosphere the effect doesn't show up in the thumbnail, but it does affect the cast speed.

Whereas if I socket Faster Casting Support with Purifying Flame it does show the effect in the Purifying Flame Thumbnail. The same is true for other Support Gems that I socket with Hydrosphere. They apply benefits but they don't list them on the thumbnail. Is this an oversight?

I tried to replicate, I see what you mean. Most people don't pay any attention to the in game ui/tooltip, because of things like this, and instead use POB.

What does and doesn't apply is very confusing on the tool tips, but generally very accurate in game and understandable in POB. There could by some technical reason for this, i'm not sure it is an oversight, but it's just much easier to go with what POB says if you are trying to learn what is applied and relative damage numbers.

It's not great that it is like this in game, but that's the way it is. I think they were intending on improving this in POE2, to make it less confusing what is and isn't applying.