Hi unit23,
Hotfixes are typically reserved for major regressions and crashes.
The workaround would be to import a copy of your skeletal mesh (using the original ), then delete the “broken” mesh. When you delete it, you can use the “Replace References” option in the delete window to replace all references with the new copy.
If you really need the fix, you can integrate it into your build of the engine from this section of code.
Specifically this section:
else if(!AssetData.IsValid())
{
// Asset data is not valid so clear the result
UObject* Value = nullptr;
BlueprintProperty->SetValue(Value);
}