$pluginOptions are object property. It is not static property, so you set it's value for one instance of this class and not for all of them.

You should use static property to do what you want, I guess.

$pluginOptions is object property. It is not static property, so you set it's value for one instance of this class (object) and not for all of them. Every object has it's own value of this property/member.

You should use static property to do what you want, I guess.