Can use weapon skill without filling requirements but cannot socket support gem

Due to the `#% Reduced Attribute Requirements` modifier being applied to the weapon but not its skill, you can be in a situation where you fill the attribute requirements to equip the weapon (and thus its skill) but not the requirements of the skill itself.

This leads to a confusing situation where the weapon is usable, its skill is usable (despite not filling requirements for it), but you cannot socket any support gem into it. The skill panel and the gemcutting interface say you cannot, without further elaboration.

Here is an infographic (I have 99 intelligence in this example):



I had the same problem with a Stoic Sceptre. I could equip the sceptre thank to reduced attribute requirements, and I could enable Discipline, but I couln't socket any support gem into it.

It's worth nothing that, as a player, I genuinely expected the reduced attribute requirement to both apply to the weapon and weapon skill. However, if this is an intentional design choice, the game should not let me use the weapon skill at all.