Technically, it was an error on the 2019- 2022 returns, and therefore should be amended.
No, not a red flag since they will see the change was the depreciation.
When you sell, there may be "Depreciation Recapture" on the property which will be Ordinary Income, so it is best to get the depreciation straightened out now before there is any confusion about recapture in the future.
Amending won't affect your tax liability for 2019-2022, so why not?
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