Trinket "Monsters have #% chance to duplicate dropped Rogue's Marker" Bug

This mod either isn't working for me, or has a big mistake in the calculations. I have a 10% change to duplicate Rogue Markers dropped Trinket, and have dropped nearly 30k Rogue Markers total at an average stack size of about 75, this is about 400 stacks worth, so I should've had the duplicated markers dropped around 40 times average.

Instead, I've only seen a duplicate stack drop once, and it's possible it was simply two different stacks that dropped together from different monsters that were closeby and just happened to have the same exact size.

I admit it's possible I might have missed a scarce few duplicate stacks and simply picked them up without thinking, but I don't believe this would be more than 4 at the very maximum, so if that was the case and the mod is working, it's got a 1% chance instead of 10%.

I haven't done much heisting this league, I only did what was necessary to get the trinket slot and equip this, so it's possible there's some bug related to that. Or it's possible that it has something to do with the changes in how multiple stacks of dropped currency were added up together for drops.

By the way, I have paid attention to the stack size of drops, and it never varies by more than 10-15 in the same zone, so it's not possible that the game is simply adding both stacks as one when it duplicates them.

There is also the very odd possibility that the mechanic was changed and now the game "stores" duplicated markers and spreads them out over the long run. I haven't tested enough to rule this out.

Correction: I forgot to calculate dropped Rogue Markers from Smugglers' Chest. So my total stacks dropped from monsters is likely more like 200, rather than 400

Update: Just had another duplicate stack drop. There was a patch today but no patch notes, so I don't know if it was fixed or what happened. I did get another trinket with the same mod in case the bug was with the item itself.

Further update: I got two more duplicate stacks. It seems to be working normally now. At least with the new trinket.