The displayName, suffix and prefix for the /team command not working

When attempting to create a display name, suffix of prefix for a team ( for example: /team add <team> [<displayname>] or with /team modify <team> <option> <value>)

it results in the attempted text turning red and the message "Invalid chat component: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path §" (see picture) appearing.

This appear both in realms and singleplayer, for both me and my friend.