I’m unclear if this is a bug or not, which is why I didn’t post to GitHub.
I’ll use the Blackwood Forest level gems or death as an example, but there are others.
In this level, the hero can be coded to move around the fire traps and appears to collect the sword and shield items that are on the map; however, those items are not awarded in the victory screen and do not appear in the items inventory after returning to the map.
I expected that picking up items like this in the map would add them permanently to my items inventory.
Some background: I’m a new unpaid player just finishing up Blackwood Forest. I had the basic sword and fur hat when I “collected” these items.