Hedge currency risk of international bonds

[RoccoLee]

Just saw an answer for why we need to hedge currency risk for international bonds.
It says that the bond’s return and currency return are generally postively correlated, therefore we need to hedge it.
Why the bond’s return and currency return are generally positively correlated???

 

[MrSmart]

Interest rates.
Interest rates are high/go up, then the currency is expected to depreciate (i.e negative returns), and the bonds sees capital losses.
This is the general case as per CFA, although this only just one possible casel leading positive correlation.