I tested this issue at different forges: 10.13.0.1186, 10.13.2.1230, 10.13.2.1236,

iChunUtil versions 4.0.0, 4.1.0, 4.1.2

I tested at this config settings:
allowCrossDimensional=1 and 2
crossDimensionalSyncingOnDeath=1
overrideDeathIfThereAreAvailableShells=1 and 2
shellStoragePowerRequirement=0

Death override works fine in the same dimension (modded as well), but cross-dimensional does not work for me, i tried Moon to Overworld, Nether to Overwold and vice versa.

Tested with only iChunUtil and Sync installed as well.

Please help.