Actually, the Minecraft version is 1.20.4, but there wasn't an option to select that version

Recently, I subscribed to Minecraft Realms in the Java version to host a map I've had with some friends for years. However, when I enter the backup world, the items in my inventory disappear, and I spawn at the old map spawn point (we changed the spawn with the /setworldspawn command), but the statistics remain. I'm not sure if it's a bug or something similar, but is there any way to change or fix this?
I tried uploading the backup to Realms to see if it was just a hosting issue, but it didn't work.