Chieftain's "Tukohama, War's Herald" possible ascendancy node visual bug

Greetings.

There's a problem with the Chieftain ascendancy "Tukohama, War's Herald". This node grants two support skills "Level 30 Ancestral Call" and "Level 20 Fist of War".

Normally, when you add a support gem to a skill gem (assuming they're compatible), a tiny letter with a colored background shows up on the skill gem's icon on the skill bar. Now, the issue is that these tiny letters indicating the skill is supported, aren't showing up at all.

I'm not sure if this is a feature or a bug. Could anyone clarify?

Thank you in advance.