You encounter the same symptom with 1939330 KBA. Even followed the 1939330 KBA, the issue still can not be solved.
You test the trusted connection by executing command with the Diagnostics Agent OS user:
sapcontrol -nr <Managed_System_Instance_Number> -user "" "" -function GetProcessList
And it fails with following error:
FAIL: Cannot create logon file
Unix like OS
KBA , BC-CST-STS , Startup Service , SV-SMG-DIA-WLY-HST , Host Adapter , Problem
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