However, the developer has a default authority, that is, the developer has evidence (express receipt for mailing the notice of repossession) to prove that you have received the notice of repossession, and you personally have not appeared at the repossession site within one month, so the developer can default that you cannot repossess the building at the site for personal reasons (abroad or prison), so you default to repossess the building.
If you have evidence that you have been to the site to repossess the building, but you can't repossess the building because of the developer, then the developer has no right to repossess the building by default. The evidence can be that you invite a house inspection company, a registered professional third-party house inspection agency, and invite them to your house for house inspection on the day of repossession, and then the house inspection report issued by them will be forwarded to the developer, so that witnesses and written evidence can prove that you have been to the repossession site!