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The other times, I'd explored everything I could get to, and couldn't find that plant room. Guess it was just bad luck with level design. Wouldn't be the first time I found a room that wasn't attached to the rest of the level.
Are you sure it's not just some silly mistake you might be making or something you're overlooking? Like not being aware that locked doors can be opened / kicked down, etc.
Again, if you ever play the game and won't be able to get to Genetrix Vesana on the level, I want a screenshot...