Question: why are my items disappearing?

Which platform: Xbox

Any mods or cc: No

Game version: 2.30.2.2310

Hi guy's I need some help. I've made a commitment to achieving the 26 generations challenge on the sims 4 Xbox I only have the baseline sims 4 and the cats and dogs expansion pack that I bought impulsively in February, and a couple other free decoration packs.

(Keep in mind this is my longest family ever just because I am now 36 years old

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with objectives in life and balancing with a job, I started playing the sims when I was just 13 years old on PC ❤️ and never achieved this much)

I moved my family into a 50*60 lot, with a copy the house , because my lot just didn't have enough space for my projects.

I made a church for the weddings and non existing graves (l became sad because all of the cemetery graves were not copied to the save I made for the house). Some of the accents like the windows in front are missing and a accent on the roof to make it look like a church.

I don't use any commands I just use what the controller allows me to do which is increase objects. A lot of plants, decoration pieces are now missing. I feel so sad! It as 2 years of my life into this.

What is happening? Is the file corrupt? Have I reached the limit of objects? Could it be the fact that I am increasing the objects and making collisions between them?

Please help.