Clocktower quest allows multiple cogs to be carried at the same time using telegrab

What I did: Cba'd to figure out the long way around, so I used telegrab. Got a first cog no problem. Telegrabbed a second cog, no problem. Wanted to pick up (not telegrab) a third cog, got told that I couldn't because they were too heavy.

What I expected to happen: It seems that the telegrab of the second cog should have been prevented too.

What actually happened: See above.

IDs of related NPCs/items: 20 through 23

2009-era source (if relevant): https://runescape.wiki/w/Clock_Tower?oldid=2028818

Screenshots or video:

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