The only place i've somewhat seen it was in eviction court. Whereas, I do not know the t's & c's here goes:
"Tenant" was being evicted from a home he was contracted to buy via "owner finance" ... rent to own b/c he had stopped paying rent under the pretense that he had fulfilled contract to buy and was now the owner.
The eviction was null and void and per the judge "you two need a real court b/c you have a serious mess on your hands"
("Landlord" / seller) skipped a payment on a certain lien to the house.
("Tenant" buyer) paid off the lien to the home b/c he had paperwork showing he was the owner.
The contract had some section in contract showing that if seller was delinquent in certain areas that the buyer could take the house from the seller assuming a certain ratio of value / equity / something else was achieved.
Brief - seller skipped payments, buyer assumed payments. Under that contract, a title company agreed that the buyer of the house was now "full owner."
Apparently, the seller knew about the contract issue and just didn't believe it would happen. In court he said he likely lost over 100k of equity...