You have to go into Beggar's Court, kill six captive workers and destroy 6 crates. But there are only two crates in the zone. I went to the FANDOM site to get exact locations for each crate, but there's nothing there at four of the locations.
Try looking around in different areas, sometimes the wiki can be out of date. Other than that, I would /bug it.
There aren't that many areas. Beggars Court is tiny. I was able to complete it by exiting the zone and re-entering 3 times.
I tested this quest out, but unfortunately I was not able to reproduce the issue you encountered, Tocino. I'm glad that you were able to find a work around so that you could keep on adventuring though! I'll keep my eyes open for any other reports of this issue. ~ Kaitheel