When generating code for large grammars we are getting this exception log. The code generation targets C#.

Exception in thread "main" java.lang.UnsupportedOperationException: Serialized ATN data element 85257 element 11 out of range 0..65535
at org.antlr.v4.runtime.atn.ATNSerializer.serialize(ATNSerializer.java:362)
at org.antlr.v4.runtime.atn.ATNSerializer.getSerialized(ATNSerializer.java:601)
at org.antlr.v4.Tool.generateInterpreterData(Tool.java:745)
at org.antlr.v4.Tool.processNonCombinedGrammar(Tool.java:400)
at org.antlr.v4.Tool.process(Tool.java:361)
at org.antlr.v4.Tool.processGrammarsOnCommandLine(Tool.java:328)
at org.antlr.v4.Tool.main(Tool.java:172)

UserGrammar.g4