SpringBoot Stabilize ScheduledTasksEndpointDocumentationTests.scheduledTasks

It's quite flaky at the moment. When it fails, the error is:

org.springframework.restdocs.snippet.SnippetException: Fields with the following paths were not found in the payload: [fixedDelay.[].nextExecution.time]
    at org.springframework.restdocs.payload.AbstractFieldsSnippet.validateFieldDocumentation(AbstractFieldsSnippet.java:218)
    at org.springframework.restdocs.payload.AbstractFieldsSnippet.createModel(AbstractFieldsSnippet.java:160)
    at org.springframework.restdocs.snippet.TemplatedSnippet.document(TemplatedSnippet.java:78) 
    at org.springframework.restdocs.generate.RestDocumentationGenerator.handle(RestDocumentationGenerator.java:191) 
    at org.springframework.restdocs.mockmvc.RestDocumentationResultHandler.handle(RestDocumentationResultHandler.java:52)   
    at org.springframework.test.web.servlet.assertj.MvcTestResultAssert.lambda$apply$1(MvcTestResultAssert.java:193)    
    at org.assertj.core.api.ThrowingConsumer.accept(ThrowingConsumer.java:31)   
    at org.assertj.core.api.AbstractAssert.catchOptionalAssertionError(AbstractAssert.java:908) 
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:212)    
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:1024) 
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:556)    
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:546) 
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)   
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)    
    at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:702)   
    at org.assertj.core.api.AbstractAssert.satisfiesForProxy(AbstractAssert.java:899)   
    at org.assertj.core.api.AbstractAssert.satisfies(AbstractAssert.java:888)   
    at org.springframework.test.web.servlet.assertj.MvcTestResultAssert.apply(MvcTestResultAssert.java:193) 
    at org.springframework.boot.actuate.autoconfigure.endpoint.web.documentation.ScheduledTasksEndpointDocumentationTests.scheduledTasks(ScheduledTasksEndpointDocumentationTests.java:56)  
    at java.lang.reflect.Method.invoke(Method.java:580) 
    at java.util.ArrayList.forEach(ArrayList.java:1597) 
    at java.util.ArrayList.forEach(ArrayList.java:1597) 

or

org.springframework.restdocs.snippet.SnippetException: Fields with the following paths were not found in the payload: [fixedRate.[].nextExecution.time]
    at org.springframework.restdocs.payload.AbstractFieldsSnippet.validateFieldDocumentation(AbstractFieldsSnippet.java:218)
    at org.springframework.restdocs.payload.AbstractFieldsSnippet.createModel(AbstractFieldsSnippet.java:160)
    at org.springframework.restdocs.snippet.TemplatedSnippet.document(TemplatedSnippet.java:78)
    at org.springframework.restdocs.generate.RestDocumentationGenerator.handle(RestDocumentationGenerator.java:191)
    at org.springframework.restdocs.mockmvc.RestDocumentationResultHandler.handle(RestDocumentationResultHandler.java:52)
    at org.springframework.test.web.servlet.assertj.MvcTestResultAssert.lambda$apply$1(MvcTestResultAssert.java:193)
    at org.assertj.core.api.ThrowingConsumer.accept(ThrowingConsumer.java:31)
    at org.assertj.core.api.AbstractAssert.catchOptionalAssertionError(AbstractAssert.java:908)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
    at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:992)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
    at org.assertj.core.api.AbstractAssert.satisfiesForProxy(AbstractAssert.java:899)
    at org.assertj.core.api.AbstractAssert.satisfies(AbstractAssert.java:888)
    at org.springframework.test.web.servlet.assertj.MvcTestResultAssert.apply(MvcTestResultAssert.java:193)
    at org.springframework.boot.actuate.autoconfigure.endpoint.web.documentation.ScheduledTasksEndpointDocumentationTests.scheduledTasks(ScheduledTasksEndpointDocumentationTests.java:65)