ADDITIONAL SYSTEM INFORMATION :
mac-aarch64

A DESCRIPTION OF THE PROBLEM :
The richtext incubator module-info.java lists jfx.incubator.input as a "require transitive":
https://github.com/openjdk/jfx/blob/master/modules/jfx.incubator.richtext/src/main/java/module-info.java#L39

However, the richtext POM, as published, does not list jfx-incubator-input as a dependency:
https://central.sonatype.com/artifact/org.openjfx/jfx-incubator-richtext/dependencies
I presume this is build from .classpath: https://github.com/openjdk/jfx/blob/master/modules/jfx.incubator.richtext/.classpath

One of these two is incorrect -- either the module does not require the input dependency, or the POM should list it as a compile-time dependency.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Configuration is at odds. Hard to expose via build tools because the gradle plugin (at least) doesn't support incubator modules easily.