House is 50% gone

Hey

I went into my single player world tonight for the first time in about 6 months. But to my surprise half of my house was gone. As if it had been cut off. I played on 1.14.4 6 months ago, and when I just joined I was also playing on 1.14.4. I have reloaded the chunks and the textures, but that didn't work. I also restarted Minecraft completely, but that didn't work either.

Here is a video I made myself (go to 0:50)

https://youtu.be/voBYoW-2F54