After upgrading the shield (illusion shield I) there is no extra enhancement for Def of Mdef.
MaxHP/SP +10% enhancement is active.
I have not tested the neutral attack reduction.
EDIT: After most recent maintenance the DEF and MDEF enhancements are now visible. I have yet to test the neutral attack reduction.
Edited by Jowgen, 11 February 2022 - 08:23 AM.