Bug when I try to generate yaml from large collection

[StevenCarre]

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