Playing on a server which has this contaption: https://youtu.be/7YWfYCEDeZQ

It relies on update order.

Turning on fastRedstoneDust disables that. I'd consider that a non-issue and would file it away as won't fix but if the aim is perfect symmetry then this fails that.

acknowledged.

yes, fRD is known for that. Suggest not counting on update order and making a slower contraption that is reliable, non-locational and non-directional. The provided contraption core concept doesn't seem to rely on update order.