Can confirm.
That's why it's so political.

And also why those vocal, extrovert, those chosen to do event committee, presentation etc. Will likely be promoted next.

Those support behind the scene will never have the chance.
This is something school don't teach.

The ability to be promotion worthy without doing the actual work.
Blame this on the Singapore education system where they groom children into thinking if they do the work individually and get a good grade they will get merit. Promotion etc.

Working world doesn't work like this.
Promotion is based on luck, raptor with boss, business growth

All those engineers work so hard overtime etc aiming for promotion should wake up theor idea.
You work extra hours save project your reward will be "this engineer very responsible, next time any problem find him."

Yep. You will be rewarded with more work.
Those cannot do one, nobody will ask them..

So people usually just aim to be average. Just on the radar. But never on the. Radar.
Visible enough to not be below average but not vocal enough to be volunteered for work.