030387: Network datasets that use Field Script evaluators configured with the VBScript language cannot be dissolved.
Description
Field Script evaluators using the VBScript language are no longer supported as of the ArcGIS Pro 3.5 release. You can no longer dissolve a network dataset with this type of evaluator.
Learn more about the types of evaluators used by a network
Solution
Update the network dataset's evaluators to the Python language before dissolving it.