Setting the property ‘AllowMultipleValues’ resets the control’s type to "Lookup" when it is inherited from SPFieldLookup class.

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Setting the property ‘AllowMultipleValues’ resets the control’s type to "Lookup" when it is inherited from SPFieldLookup class.

Another MSDN SharePoint Related Post From Nishand’s Blog:

When you develop a custom field type that inherits from SPFieldLookUp/SPFieldUser(not sure about any other controls) . The derived field type has its own rendering controls

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Setting the property ‘AllowMultipleValues’ resets the control’s type to "Lookup" when it is inherited from SPFieldLookup class.