Sun Aug 25 2019 15:44:03 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
62814 Tomcat 9 Document dev NEW --- Use readable names for cluster channel/map options in documentation AND sample configurations 2018-11-26
61971 Tomcat 9 Document dev NEW --- documentation for using tomcat with systemd 2018-01-06
62723 Tomcat 9 Document dev NEW --- Clarify "channelSendOptions" value in cluster documentation 2018-09-14
3 bugs found.

as

File a new bug in the "Documentation" component of the "Tomcat 9" product