Parsing throws NumberFormatException: For input string: "post" in SwaggerConverter

[garydgregory]

The following is thrown:

java.lang.NumberFormatException: For input string: "post"
	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
	at java.base/java.lang.Integer.parseInt(Integer.java:668)
	at java.base/java.lang.Integer.parseInt(Integer.java:786)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:1140)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:608)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:531)
	at io.swagger.v3.parser.converter.SwaggerConverter.convert(SwaggerConverter.java:250)
	at io.swagger.v3.parser.converter.SwaggerConverter.readResult(SwaggerConverter.java:104)
	at io.swagger.v3.parser.converter.SwaggerConverter.readLocation(SwaggerConverter.java:85)
	at io.swagger.v3.parser.OpenAPIV3Parser.read(OpenAPIV3Parser.java:124)
	at io.swagger.v3.parser.OpenAPIV3Parser.read(OpenAPIV3Parser.java:113)
	at redacted
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)

Running:

new OpenAPIV3Parser().read("swagger.json");

with swagger-parser-v2-converter-2.1.20.jar.
For the attached input.
swagger.json