Problem when display as a key lang (minimessage format) - MythicMobs 5.3.1 to 5.3.2

When the mob display name is a key lang in minimessage format, the plugin sends an error on start. In addition, it's not possible to spawn a mob correctly, which has this type of display name (customs models don't load for example). On an older version (MythicMobs 5.2.5), it worked.

• Example of display as a key lang (which refers to the resource pack) : https://pastebin.com/Ws4kGYjH (according to this document : https://docs.advntr.dev/minimessage/format.html#translatable) ;
• The error : https://pastebin.com/eDAiiczh ;

The problem appears on :

• MythicMobs versions 5.3.1 (release) to 5.3.2 (lasts dev builds) ;
• On version 1.19.4 (with the Paper build 549) ;
• On version 1.20.1 (with the Paper build 43) ;