In the Commodore 64 version, anything that puts you to sleep, a sleep spell, a sleep field (either shot at you or walked into) or a sleep trap on a chest would cure the poison. I'll take your word that Hole Up And Camp does not because I do not recall, but I would bet that if you get ambushed and your character is asleep during the beginning of the ambush, that would cure it too. This was a nice effect when getting a lot of chests or facing certain enemies, as you wouldn't have to use as many cure...
That solution works for me.
I have tried to recreate this several times with the verbose flag on, and it has not happened. Possibly the --verbose fixes it, more likely it is just a very intermittent bug.
Just as an aside, I really appreciate the work you'all have done on this. Even with the minor bugs I found, this is hands down the best way to play this game that exists. I had so much fun reliving this blast from my childhood, and the game still really holds up pretty well and is still fun.
I played the Commodore 64 version and it was that way under all conditions. I just double checked right now using both a c64 emulator and the Dos version from GOG; got poisoned by a chest, ran into LB's castle and got the sleep effect from Hawkwind's sleep fields, and the poison was gone when I woke up, on both versions.
Sorry, should have mentioned that. Using xu4 1.3 for x86_64 Windows. I will try a few times with the verbose command, but I already beat the game so may not play it enough to encounter it again.
Every now and then, none of the keys on the main menu work.
This is really important if you are actually playing the game without cheating and are grinding money. Quitting works, but I should not have to do that, per the original game mechanics.