If there are more than one feedback loop in any circuit ( voltage regulator); to check the stability should one break all the loops and check for stability OR the loop having highest loop gain (A*beta) will have potential stability threat, if the circuit is safe there, other feedback loops may not be as significant.
In other words, having more than feedback loop is bad design, because optimising the circuit for all the three loops (say) to be stable is difficult task.
Regards