Challenge Room Rewards Missing

[Chancellor23]

When I started Chapter 6, Mole Underground, I discovered that some of the rewards I earned in the Challenge Rooms were missing. Is this normal after getting the ShadowHand?

Basically, all of my left-hand rewards are gone: the shovel, the bayonet, and the left-hand pistol. The 1 Key only cycles through ShadowHand modes only.

Mostly, I'm finding ammo for the Vampire Weapons and not for the traditional weapons, such as the shotgun and grenade launcher. It looks like the game is switching from standard weapons to a different set, i.e., the vampire guns.

Is that correct? If so, it looks like putting off the Challenge Rooms could be a mistake because if you do the earlier Challenge Rooms after you reach Chapter 6, you won't get the benefits because you already have the ShadowHand.