Dynamic bean generation issue with default documenttype editor values

Dynamic bean generation issue, see reproduction path below.

Reproduction path:

• Create a new archetype 14.4.0 project
• Install the banner component
• At a banner to the homepage and select a banner document
• Check the banner on the site
• Goto the content document type editor
• Edit the banner document. Add two string fields without modifing the Field properties!
• Goto to the homepage and see that the banner is not shown.
• See error below.
• The issue is that the path property for both string fields is set by the system to "string" and "string_", renaming the path "string_" to "string1" solves the problem.

Error:
[INFO] [talledLocalContainer] 15.01.2021 13:23:37 INFO http-nio-8080-exec-2 [DynamicBeanDefinitionService.generateBeanDefinition:180] Creating bean of document type myproject:bannerdocument from parent bean Banner.
[INFO] [talledLocalContainer] 15.01.2021 13:23:37 WARN http-nio-8080-exec-2 [HstComponentInvokerImpl.logComponentException:255] Component exception caught on window banner with component org.onehippo.cms7.essentials.components.EssentialsBannerComponent: com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalStateException: Duplicate method signature for public java.lang.String org.example.beans.Banner$Bannerdocument$47vDqaQ3.getString() at com.google.common.cache.LocalCache.get(LocalCache.java:3952)
[INFO] [talledLocalContainer] 15.01.2021 13:23:37 WARN http-nio-8080-exec-2 [AbstractBaseOrderableValve.handleComponentExceptions:306] Component exception(s) found in page request, 'Request{ method='GET', scheme='http', host='localhost:8080', requestURI='/site/', queryString='null'}'.
[INFO] [talledLocalContainer] 15.01.2021 13:23:37 WARN http-nio-8080-exec-2 [DefaultPageErrorHandler.logWarningsForEachComponentExceptions:51] Component exception on org.onehippo.cms7.essentials.components.EssentialsBannerComponent : com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalStateException: Duplicate method signature for public java.lang.String org.example.beans.Banner$Bannerdocument$47vDqaQ3.getString()