I had an issue with duplicate animations and the build errored out as expected. However the meta data information was not correct in my opinion. - It kept referencing LOD02 (last LOD in my project) when it should have referenced the LOD that it was building.
as can be seen in the pics. first pic the LOD00 is being built,
Compiling GLTF data file SGS233AAircraft_Cockpit_LOD01.gltf...but the error line
Duplicate animation name: animation : 'INSTRUMENT_Knob_Altimeter_1'.
the details reference Metadata LOD02 (see pic2)