Gameplay Bug, Cannot Progress (?)

[Opeth]

I may be wrong and this contains minor early spoilers so don't proceed if you haven't played at least a few hours.

Anyway, I got the acid created using the four chemicals, I poured it in the vial, then I went to the blocked passageway in the main hall and used the acid dissolving the slime. All seemed good until I thought, hey, maybe I should refill this thing with more acid just in case it's needed later.

I made my way back to the laboratory only to find that the empty vial could not be used there, even though the valves were functional, so I couldn't create more. I thought ok, I won't need it and should continue, but that didn't work out because upon reaching the passageway the slime was reset like most objects.

I've got the exact same problem. Thought the same, why don't I get some more acid , if I need it later ? Well, the vial cannot be used anymore, always getting a "Cannot be used here" (or similar) message.

I'm afraid I have to start over again ..