Task Scheduler: error 2147943767 (0x80070557) when starting second action

event-log.xml

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-TaskScheduler" Guid="{DE7B24EA-73C8-4A09-985D-5BDADCFA9017}" /> 
  <EventID>104</EventID> 
  <Version>0</Version> 
  <Level>2</Level> 
  <Task>104</Task> 
  <Opcode>0</Opcode> 
  <Keywords>0x8000000000000000</Keywords> 
  <TimeCreated SystemTime="2017-08-25T22:34:23.310635500Z" /> 
  <EventRecordID>12</EventRecordID> 
  <Correlation /> 
  <Execution ProcessID="1412" ThreadID="12732" /> 
  <Channel>Microsoft-Windows-TaskScheduler/Operational</Channel> 
  <Computer>Crux</Computer> 
  <Security UserID="--" /> 
  </System>
- <EventData Name="LogonFailureEvent">
  <Data Name="UserName">\Update-blacklist</Data> 
  <Data Name="ErrorDescription">LogonUserS4U</Data> 
  <Data Name="ResultCode">2147943767</Data> 
  </EventData>
  </Event>

test.xml

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.4" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <RegistrationInfo>
    <Date>2017-08-26T00:28:31.6189683</Date>
    <Author>PC\Alex</Author>
    <URI>\test</URI>
  </RegistrationInfo>
  <Triggers />
  <Principals>
    <Principal id="Author">
      <UserId>--</UserId>
      <LogonType>S4U</LogonType>
      <RunLevel>HighestAvailable</RunLevel>
    </Principal>
  </Principals>
  <Settings>
    <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>false</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
    <AllowHardTerminate>true</AllowHardTerminate>
    <StartWhenAvailable>false</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
    <IdleSettings>
      <StopOnIdleEnd>true</StopOnIdleEnd>
      <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>true</Enabled>
    <Hidden>false</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>
    <UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>
    <WakeToRun>false</WakeToRun>
    <ExecutionTimeLimit>PT72H</ExecutionTimeLimit>
    <Priority>7</Priority>
  </Settings>
  <Actions Context="Author">
    <Exec>
      <Command>C:\hello\blacklist\reload_hello.bat</Command>
      <WorkingDirectory>C:\hello\blacklist</WorkingDirectory>
    </Exec>
  </Actions>
</Task>

update-blacklist.xml

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.4" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <RegistrationInfo>
    <Date>2017-08-26T00:23:38.1714632</Date>
    <Author>PC\Alex</Author>
    <URI>\Update-blacklist</URI>
  </RegistrationInfo>
  <Triggers>
    <BootTrigger>
      <Repetition>
        <Interval>P1D</Interval>
        <StopAtDurationEnd>false</StopAtDurationEnd>
      </Repetition>
      <ExecutionTimeLimit>PT30M</ExecutionTimeLimit>
      <Enabled>true</Enabled>
    </BootTrigger>
  </Triggers>
  <Principals>
    <Principal id="Author">
      <UserId>--</UserId>
      <LogonType>S4U</LogonType>
      <RunLevel>HighestAvailable</RunLevel>
    </Principal>
  </Principals>
  <Settings>
    <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>false</StopIfGoingOnBatteries>
    <AllowHardTerminate>true</AllowHardTerminate>
    <StartWhenAvailable>false</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>true</RunOnlyIfNetworkAvailable>
    <IdleSettings>
      <StopOnIdleEnd>true</StopOnIdleEnd>
      <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>true</Enabled>
    <Hidden>false</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>
    <UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>
    <WakeToRun>false</WakeToRun>
    <ExecutionTimeLimit>PT1H</ExecutionTimeLimit>
    <Priority>7</Priority>
  </Settings>
  <Actions Context="Author">
    <Exec>
      <Command>C:\hello\blacklist\gen-blacklist.bat</Command>
      <WorkingDirectory>C:\hello\blacklist</WorkingDirectory>
    </Exec>
    <Exec>
      <Command>C:\hello\blacklist\reload_hello.bat</Command>
      <WorkingDirectory>C:\hello\blacklist\</WorkingDirectory>
    </Exec>
  </Actions>
</Task>

wtf.md

So, task Update-blacklist with 2 actions fails on second action while another similar (identical in term of rights) task is ok on this same action. And something weird, the username logged in the error of the second action: why is it "\Update-blacklist" ?? It should be PC\Alex.

Feature ?