Audio Source Effect Preset Resets to NULL every time editor is restarted (4.27)

Development Programming & Scripting
,
2

On editor restart, this appears in the log:

LogUObjectGlobals: Warning: Failed to find object ‘Object /Game/Audio/Effects/Waveform_Enveloper3.Waveform_Enveloper3’
LogAssetEditorSubsystem: Error: Opening Asset editor failed because of null asset

Attempting to open the Source Effect Preset ‘waveform_enveloper3’ gives this:
LogLinker: Warning: Unable to load Waveform_Enveloper3 with outer Package /Game/Audio/Effects/Waveform_Enveloper3 because its class does not exist