JwtHeader.fromJsonString fails on scala 2.12.12

[seriar]

Trying to parse the JWT with scala 2.12.12 fails

The following snippet will return false on validation:

val jwt = JsonWebToken(JwtHeader("HS256"), JwtClaimsSet(Map.empty[String, String]), "test")
JsonWebToken.validate(jwt, "test")

There appears to be a problem to parse the header properly and the following header parsing throws an exception by itself:

JwtHeader.fromJsonString(JwtHeader("HS256").asJsonString)

Exception in thread "main" java.lang.NoSuchMethodError: scala.collection.immutable.List.$anonfun$flatMap$1$adapted(Lscala/runtime/BooleanRef;Lscala/runtime/ObjectRef;Lscala/runtime/ObjectRef;Ljava/lang/Object;)Ljava/lang/Object;
	at java.base/java.lang.invoke.MethodHandleNatives.resolve(Native Method)
	at java.base/java.lang.invoke.MemberName$Factory.resolve(MemberName.java:1041)
	at java.base/java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1066)
	at java.base/java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:2040)
	at java.base/java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(MethodHandles.java:2453)
	at java.base/java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodHandleNatives.java:501)
	at org.json4s.MonadicJValue.findDirectByName(MonadicJValue.scala:25)
	at org.json4s.MonadicJValue.$bslash(MonadicJValue.scala:18)
	at authentikat.jwt.JwtHeader$.fromJsonString(JwtHeader.scala:42)
	at com.playground$.main(App.scala:17)
	at com.playground.App.main(App.scala)

The issue possibly comes from json4s and scala 2.12.12 problem with older json4s versions (e.g. scala/bug#12100), and if so possibly the json4s should be updated here