Sorry for the delay, been a bit busy. Here is a world backup which should help reproduce the issue. When opened in 1.17.1 vanilla you should see a double chest placed on lime concrete with a single stack of lime concrete. On the purple concrete is a wood chest from my mod Expanded Storage which has a stack of purple concrete. ( but that doesn't really pertain to the issue much )
If you open this world in 1.18 (pre-5 as of writing this) instead you shouldn't be able to see the vanilla chest despite it being there, also the items in the inventory are gone.
Sorry for the delay, been a bit busy. Here is a world backup which should help reproduce the issue. When opened in 1.17.1 vanilla you should see a double chest placed on lime concrete with a single stack of lime concrete. On the purple concrete is a wood chest from my mod Expanded Storage which has a stack of purple concrete. ( but that doesn't really pertain to the issue much )
If you open this world in 1.18 (pre-5 as of writing this) instead you shouldn't be able to see the vanilla chest despite it being there, also the items in the inventory are gone.
The world:
[media]