A) The problem is a known issue, it is currently being worked on.
B) The problem is a known issue, it is currently being worked.
Both are incorrect. Each contains a comma splice. Also, while not strictly incorrect, each sentence contains two inadvisable passive voice clauses. Finally, in the second sentence, "worked" is an annoyingly faddish bit of truncated execu-speak, no matter who said it.
Note that as a rule of thumb the loftier a person's title, the more atrociously he writes. Most executives regard themselves as having more important things to do than expressing themselves clearly.
"We are aware of the issue and currently working on a solution."