Biobot internal storage strange behavior

I noticed on one of common loads that my biobots dropped lead. That was strange because at that moment there was NO active tasks related to that. And that was the issue, because it dropped it into hot materials and make some mess.
Later today I noticed same behavior. On the screenshot you should see that right now biobot internal storage contains 3 type of items and only one of them are related to current task (wall building and/or dropping debris into one spot).
I suspect that this bug happens when I use high priority tasks (yellow alert). I think that biotot forget it's current task at that moment (while switching to urgent task), but DON'T drop items it used for it. And those items are stuck inside it until biobot ends it's battery.
I attached my save file, but you may see that at load moment biobots drops ALL it's internal items. That's also not so well.