FormatException on import Unity 2020.3.11f1 URP

Error during deserialization in MapMagic 2 Bundle, first import, version 2.1.5 in Unity 2020.3.11 URP, clean project, only MapMagic 2 is imported. OS is Windows 10, regional format is Polish and region is Poland, system language is English.

FormatException: Input string was not in a correct format.
System.Number.ParseSingle (System.String value, System.Globalization.NumberStyles options, System.Globalization.NumberFormatInfo numfmt) (at :0)
System.Single.Parse (System.String s, System.Globalization.NumberStyles style, System.Globalization.NumberFormatInfo info) (at :0)
System.Single.Parse (System.String s) (at :0)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collections.Generic.IList`1[T] unityObjs) (at Assets/MapMagic/Tools/Serializer/Deserialize.cs:55)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collections.Generic.IList`1[T] unityObjs) (at Assets/MapMagic/Tools/Serializer/Deserialize.cs:183)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collections.Generic.IList`1[T] unityObjs) (at Assets/MapMagic/Tools/Serializer/Deserialize.cs:183)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collections.Generic.IList`1[T] unityObjs) (at Assets/MapMagic/Tools/Serializer/Deserialize.cs:183)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collections.Generic.IList`1[T] unityObjs) (at Assets/MapMagic/Tools/Serializer/Deserialize.cs:157)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collections.Generic.IList`1[T] unityObjs) (at Assets/MapMagic/Tools/Serializer/Deserialize.cs:183)
Den.Tools.Serialization.Serializer.DeserializeRecursive (System.Object[] splitString, System.Collections.Generic.Dictionary`2[TKey,TValue] deserializedIdsObjs, System.Collection