I have the same problem. Any fix. I no longer have my custom add-on in my instance. So I tried to import it and I get the error "the <ADD-ON NAME> add-on project could not be imported becasue an add-on with this name already exists" Ok, but I can't edit/update my addon from where it is in 'other apps and add-ons'. It only gives me the features to validate & package, extraction, and mapping. None of which let's me edit code or change and bump the version.
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