Confirmed, and it's worse than it looks. The one-per-character rule the Maple Administrator describes IS implemented — but only in the inventory, not at the quest turn-in.

So here's what actually happened to you: the quest let you hand in, ate the letters you'd collected, marked itself complete and printed "Rewards: 1x Scroll of Secrets" in your chat log — and then the inventory quietly refused the second scroll and you received nothing. You paid for a reward you couldn't be given.

The real game blocks this one step earlier: the turn-in itself is refused and the NPC repeats the line you screenshotted ("could it be that you're already carrying a Scroll of Secrets?"), so you keep your letters and can turn in once you've used the scroll you have.

The patch adds that check to both the "can I turn this in?" test and the turn-in itself, so the quest will simply stay available instead of burning your materials. This also covers every other one-of-a-kind quest reward — medals and monster cards had the same hole.

Confirmed, and it was worse than it looked. The one-per-character rule the Maple Administrator describes IS implemented — but only in the inventory, not at the quest turn-in. So what actually happened to you: the quest accepted the hand-in, ate the letters you'd collected, marked itself complete and printed "Rewards: 1x Scroll of Secrets" in your chat log — and then the inventory quietly refused the second scroll, so you received nothing. You paid for a reward you couldn't be given.

The original game blocks this one step earlier: the turn-in itself is refused, so you keep your letters and the quest simply stays available until you've used the scroll you already have. That check is now in both the "can I hand this in?" test and the hand-in itself, so the Maple Administrator will show you the progress line you screenshotted ("…could it be that you're already carrying a Scroll of Secrets?") instead of taking your materials.

It covers every other one-of-a-kind quest reward too — medals and monster cards had the same hole. One deliberate exception: if the same quest also takes that item off you as part of the hand-in, it isn't blocked, because you're not ending up with two.

[Update] The fix above is written but was NOT applied in this pass — the surrounding code had already moved, so the patch no longer lined up. Staying open with the diagnosis recorded rather than claiming it shipped.

Fixed — your read was exactly right, and v83 says so in the quest's own text.

The Scroll of Secrets is flagged as a one-of-a-kind item in the WZ, and we already refused to add a second copy, which is why it correctly never appeared. The missing half is that the turn-in should have been refused outright: the reference server runs over a quest's reward items and blocks completion when the character cannot hold one, rather than completing and quietly dropping it. The authentic progress line for that quest even spells it out — 'could it be that you're already carrying a Scroll of Secrets? You may only hold one Scroll of Secrets at a time.' So you burned a completion for nothing.

Both the readiness check and the completion itself now refuse when a guaranteed reward is a unique item you already hold or wear. I limited it to GUARANTEED rewards on purpose — the prop-weighted random rewards are picked at grant time, so what you would get is not knowable at gate time, and v83 does not gate a turn-in on a random outcome.

The test I wrote for this turned up a second, unrelated problem worth telling you about: some quest rewards V83_1102057, which was not in our item catalog at all — so that reward has been silently granting nothing. It is a real v83 item, the Ludibrium Cape (level 100, 43 weapon def / 48 magic def, 5 upgrade slots). Imported and verified against Character.wz. There is now a test that every quest reward resolves to a real item, since a missing key would have quietly disabled this very rule.

On develop as fd6972f8.