Fizzy Cyst

The save file doesn't have the information about the past concerning where that canister came from. It's just a snapshot at a single point in time. It will show the symptom, to be sure, but it does not have a record of the cause. That's why your story about what you did to get that canister is relevant for the report.

That's relevant information for a defect report. If I had to guess, it's that the game is populating the list of "available gases" only through operation of the canister filler and not through the empty command. The fix should be easy; ensure the gas is on that list in the code that creates canisters, not in any code for the operations that cause them to be created (canister filler, empty pipe).

Can also confirm on Windows SU-291640. it's not only true for gases but also for liquids. The single-click contents-of-tile pop-up list of blocks, one per substance, is the one that's missing the gas or liquid. On first click the amber highlight-border shows the mesh tile. On second click the highlight disappears; since there's no block, there's no place to put the highlight.