Mining Nodes don't trigger if too far away when cleared

Something I've noticed a couple of times - if you're clearing the monsters from a mining node (verisium or crimson iron are the most common I've noticed), and you kill trigger the 'clear' while offscreen from the mining node, it gets 'consumed' (counts as cleared) but doesn't spawn the miner or mark the ore.

Put another way, if you kill whatever mob triggers the mining node to count as 'marked' for mining too far away from the node, all of the ore you would have gotten is permanently lost.