If you're really chipping from the weeds, that doesn't work. When you say "weeds" is that what the lie said? Or did it say rough, or deep rough, or light brush??
Because I just went looking for "weeds" with a 30-40 lie near the 18th on BPB and couldn't find any. I hacked about 6 or 7 shots to the right of the green around the bunker and found lots of 60-70 deep rough and some 40-50 light brush. I was able to move the ball using a pitch, full, and punch shots. And hitting it hard.
Can you be more specific where the "black hole" type lie was relative to the 18th green?