Running IFS version 3.6.1 and KSP 1.4.4.

When more than one IFS tank is placed on a vessel using symmetry, the inflight GUI allows independently switching resource types, resulting in a different resource for the tanks on each side of a vessel with mirror symmetry for example.

However upon vessel load, the assigned resource types on symmetrical tanks are set to the same resource type. This can result in the creation or destruction of resources.