Resized nested grid doesn't follow usual layout rules

[waaverecords]

Subject of the issue

Resizing in a subgrid does not position its items properly.
They end up on top of each other.

This is a subgrid of width 2 (cells):

When resized to width of 1:

Your environment

Gridstack v10.0.1
Browser: Chrome

Steps to reproduce

Go to nested demo: https://gridstackjs.com/demo/nested.html
Resize the subgrid item containing element 6 and 7 to its smallest width possible.
Element 6 and 7 are now on top of each other.

Expected behavior

Elements should follow usual layout rules.