I have upgraded OneDev from 7.7.2 to 7.9.3 and upon server start the following exception is logged

io.onedev.commons.utils.ExplicitException: Error validating build spec (project: **HIDDEN***, commit: **HIDDEN***, location: jobs[0].postBuildActions[0].receivers, message: Malformed notification receiver)
	at io.onedev.server.job.DefaultJobManager.validateBuildSpec(DefaultJobManager.java:214)
	at io.onedev.server.job.DefaultJobManager.schedule(DefaultJobManager.java:1024)
	at io.onedev.server.job.DefaultJobManager$$EnhancerByGuice$$135201057.GUICE$TRAMPOLINE(<generated>)
	at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:74)
	at io.onedev.server.persistence.SessionInterceptor$1.call(SessionInterceptor.java:23)
	at io.onedev.server.persistence.DefaultSessionManager.call(DefaultSessionManager.java:90)
	at io.onedev.server.persistence.SessionInterceptor.invoke(SessionInterceptor.java:18)
	at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:75)
	at com.google.inject.internal.InterceptorStackCallback.invoke(InterceptorStackCallback.java:55)
	at io.onedev.server.job.DefaultJobManager$$EnhancerByGuice$$135201057.schedule(<generated>)
	at io.onedev.server.entitymanager.impl.DefaultProjectManager$StorageEntryListener$4$1.run(DefaultProjectManager.java:1168)
	at io.onedev.server.persistence.DefaultSessionManager$2.call(DefaultSessionManager.java:111)
	at io.onedev.server.persistence.DefaultSessionManager$2.call(DefaultSessionManager.java:107)
	at io.onedev.server.persistence.DefaultSessionManager.call(DefaultSessionManager.java:90)
	at io.onedev.server.persistence.DefaultSessionManager.run(DefaultSessionManager.java:107)
	at jdk.internal.reflect.GeneratedMethodAccessor54.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.google.inject.internal.DelegatingInvocationHandler.invoke(DelegatingInvocationHandler.java:50)
	at com.sun.proxy.$Proxy26.run(Unknown Source)
	at io.onedev.server.entitymanager.impl.DefaultProjectManager$StorageEntryListener$4.call(DefaultProjectManager.java:1164)
	at io.onedev.server.entitymanager.impl.DefaultProjectManager$StorageEntryListener$4.call(DefaultProjectManager.java:1158)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at com.hazelcast.executor.impl.DistributedExecutorService$Processor.run(DistributedExecutorService.java:276)
	at com.hazelcast.internal.util.executor.CachedExecutorServiceDelegate$Worker.run(CachedExecutorServiceDelegate.java:217)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
	at com.hazelcast.internal.util.executor.HazelcastManagedThread.executeRun(HazelcastManagedThread.java:76)
	at com.hazelcast.internal.util.executor.HazelcastManagedThread.run(HazelcastManagedThread.java:102)

After the upgrade I opened the OneDev build spec file, removed the receivers and added them back in. After saving the build spec the commit did not reveal any changes with regard to the notification section. Only the spec version has been upgraded, the interpreter has been changed from BashInterpreter to ShellInterpreter + shell: bash property and cpu/memory requirements properties have been deleted because these settings to not exist anymore in the UI. So I guess something else is wrong.

The build spec looks like the following (which private data being marked as **HIDDEN**)

version: 19
jobs:
- name: Release
  jobExecutor: Docker
  steps:
  - !CheckoutStep
    name: Checkout
    cloneCredential: !SshCredential
      keySecret: **HIDDEN***
    withLfs: false
    withSubmodules: false
    checkoutPath: **HIDDEN***
    condition: ALL_PREVIOUS_STEPS_WERE_SUCCESSFUL
  - !CommandStep
    name: Build
    runInContainer: true
    image: **HIDDEN***
    interpreter: !ShellInterpreter
      shell: bash
      commands:
      - **HIDDEN***
      - **HIDDEN***
      - **HIDDEN***
    useTTY: false
    condition: ALL_PREVIOUS_STEPS_WERE_SUCCESSFUL
  retryCondition: never
  maxRetries: 3
  retryDelay: 30
  caches:
  - key:**HIDDEN***
    path: **HIDDEN***
  - key: **HIDDEN***
    path: **HIDDEN***
  timeout: 3600
  postBuildActions:
  - !SendNotificationAction
    condition: always
    receivers: group(Developers)