The Tomcat 8.5.24 service.bat file shows a parameter --JvmOptions9. This parameter does not appear to be documented at https://tomcat.apache.org/tomcat-8.5-doc/windows-service-howto.html#comments_section as of the creation of this bug.
Thanks for the report. - trunk for 9.0.4 onwards - 8.5.x for 8.5.27 onwards - 8.0.x for 8.0.49 onwards - 7.0.x for 7.0.84 onwards