A word the encompasses errors, issues and inaccuracies [duplicate]
deficiencies
failings
shortcomings
weaknesses
flaws
Following your comments, if I get the drift I would propose* chink in armour. Alternatively weak area,weak spot or *blind spot*are perfectly acceptable expressions.
You might consider a qualifier on the term technical debt, such as
Unidentified Technical Debt
This will use a term common to management, "technical debt", while also casting it in one of the most dangerous lights, misidentification.