Short-term rentals COULD be reported on Schedule C If there is substantial involvement, such as getting ready weekly, replenishing soaps and linens, that sort of thing.
If reported as a business, there would be no passive loss limit, however you don't say where you live. If the lake home is in another state, you probably do not engage with it as a business.
As a rental, there would be no other way of claiming the loss on your 2021 return.
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