Bug when I try to generate yaml from large collection

Hi, I'm trying to generate yaml from my entities Pays, Region, Department and Ville.
The first three work fine but for Ville, which has 35853 items, I get this error:
Class Closure is an internal class marked as final that cannot be instantiated without invoking its constructor
Is this a bug?
Also, please consider upgrading to make your very handy bundle compatible with symfony 5