I just successfully completed a Hydra mission to collect 5 crates from Arlington. This took about 120 mining cycles.
As I wanted to carry on mining I went to Hydra to collect my reward and took another Arlington Hydra mission to collect a further 3 crates.
However after mining about 100 cycles of mining not one crate has dropped. Is this a bug because I took a mission in the same roid field? I seem to be stuck with an impossible hydra mission now…