BUG: 5.1.6 - Error creating bean with name 'groovyPagesTemplateEngine'

[codeconsole]

Expected Behavior

The mail plugin no longer works starting with 5.1.6

Any version prior to 5.1.6, it works fine.
e.g. 5.1.5 and below

By only adding implementation 'org.grails.plugins:mail:3.0.0' to a Grails 5.1.6 build.gradle it would be expected that the application would start up with no errors, but the application fails to start due to a dependency injection error.

Actual Behaviour

| Running application...
2022-04-03 23:11:49.867 ERROR --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mailMessageContentRenderer': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'groovyPagesTemplateEngine': Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'classLoader' of bean class [org.grails.gsp.GroovyPagesTemplateEngine]: Bean property 'classLoader' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:628)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
        at grails.boot.GrailsApp.run(GrailsApp.groovy:99)
        at grails.boot.GrailsApp.run(GrailsApp.groovy:485)
        at grails.boot.GrailsApp.run(GrailsApp.groovy:472)
        at website.Application.main(Application.groovy:11)
...
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'groovyPagesTemplateEngine': Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'classLoader' of bean class [org.grails.gsp.GroovyPagesTemplateEngine]: Bean property 'classLoader' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1744)
...
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'classLoader' of bean class [org.grails.gsp.GroovyPagesTemplateEngine]: Bean property 'classLoader' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
        at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:243)

Steps To Reproduce

sdk use grails  5.1.6
sdk use java 11.0.14-zulu 
grails create-app test
cd test
vi build.gradle

Add implementation 'org.grails.plugins:mail:3.0.0' to the end of dependencies {

grails run-app
``

### Environment Information

% sw_vers
ProductName: macOS
ProductVersion: 12.2.1
BuildVersion: 21D62
% sysctl -a | grep brand
machdep.cpu.brand: 0
machdep.cpu.brand_string: Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz

### Example Application

_No response_

### Version

5.1.6

[codeconsole]

Closing, appears to be related to #12460