After the Spring started Amber started crashing after few steps... Downloaded Ender and crashed too but Ender had a bug report
I saw the first line of the bug report: out of memory so I just turned flavour things off and terrain smoothing off aswell...
It started working so turns out my laptop is too weak for haven and heart
Winter just had less things to generate so it worked well (I joined during winter)
However, Amber still crashes while I enter any building :c I prefer Amber so I play with it and while in base where I have to enter buildings, I need to swap for ender or default one xD