I migrated to Gridstack 2.0.0 and I noticed that relative units do not work for "cellHeight" anymore. Here is the minimal working example: https://jsitor.com/YYbJFy7UY

To reproduce... First run with line cellHeight: "8rem" comented and everything seems to work. But then uncomment it. You will see that positioning / placeholder don't work if line is not commented out.