JsonObject not Serializable since 4.19.2

[Kai-W]

I am trying to upgrade an old project from 4.19.1 to the current version. In the project Java Serialization is used to communicate between some components and a newer Feature sends JsonObjects over the communication.
in version 4.19.1 JsonObject extends LinkedHashMap and LinkedHashMap implements Serializable so it worked
in version 4.19.2 JsonObject was changed to implement the Map interface and with it the Serializable interface got droped.
Is this a deliberate change?