Graphical issues in version 1.6.1

[secondhandweed]

Operating System

Windows

Description of bug

Some issues with graphical things in 1.6.1
No floating blocks when I break them
No cracks forming on blocks as I break them
No mobs
What could be causing this? How can I fix it?

Steps to reproduce

create an instance in 1.6.1 with no mods

open it

broken

Suspected cause

No response

This issue is unique

• I have searched the issue tracker and did not find an issue describing my bug.