  For magnetic knots and links in plasmas we introduce an internal twist and
study their dynamical behavior in numerical simulations. We use a set of
helical and non-helical configurations and add an internal twist that cancels
the helicity of the helical configurations or makes a non-helical system
helical. These fields are then left to relax in a magnetohydrodynamic
environment. In line with previous works we confirm the importance of magnetic
helicity in field relaxation. However, an internal twist, as could be observed
in coronal magnetic loops, does not just add or subtract helicity, but also
introduces an alignment of the magnetic field with the electric current, which
is the source term for helicity. This source term is strong enough to lead to a
significant change of magnetic helicity, which for some cases leads to a loss
of the stabilizing properties expressed in the realizability condition. Even a
relatively weak internal twist in these magnetic fields leads to a strong
enough source term for magnetic helicity that for various cases even in a low
diffusion environment we observe an inversion in sign of magnetic helicity
within time scales much shorter than the diffusion time. We conclude that in
solar and stellar fields an internal twist does not automatically result in a
structurally stable configuration and that the alignment of the magnetic field
with the electric current must be taken into account.
