No, you can't cancel your amended return. During normal times, an amended returns usually takes six to eight weeks to show up in the IRS system. It's now taking up to a year, or more for amended returns to be processed. I would go ahead and file 2020 with Form 3115 (remove depreciation for 2019). I would also explain that you amended 2019 before you realized you could file form 3115.
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