Dynamic method withHttp does not inject into singleton controllers or services.

[cstorar]

I have a Grails 3.3.6 app that uses singleton controller and service classes. When trying to use withHttp() in my service class I get:
Caused by: groovy.lang.MissingMethodException: No signature of method

I eventually found a stop-gap solution after reading graemerocher's comment in grails/grails-core#9648
Using this resolved my problem although it's not the best approach:
class Application extends GrailsAutoConfiguration { static { ExpandoMetaClass.enableGlobally() }

I'd like to request this issue be investigated to have this plugin provide better singleton support. If there is a better alternative to the solution I listed above I'd love to see it!