3352744 - Dump MESSAGE_TYPE_X_TEXT (Message cannot be processed in Plugin mode HTTPS) raised when executing work items from Fiori My Inbox

In workflow exist class, an E error message is raised. The behavior in backend workflow inbox SBWP is working as expected, but in Fiori My Inbox exception is raised and MESSAGE_TYPE_X_TEXT dump with error "Message cannot be processed in Plugin mode HTTPS" is raised.

The behavior in SBWP (as expected):

The behavior in My Inbox (unexpected):

Dump details (example):

Category               ABAP programming error
Runtime Errors         MESSAGE_TYPE_X_TEXT
ABAP Program           CL_SWF_RUN_WIM_LOCAL==========CP
Application Component  BC-BMT-WFM

Short Text
    The current application has intentionally triggered a termination with
    a short dump.

Error analysis
    Short text of the error message:
    "Exception CX_SY_MESSAGE_IN_PLUGIN_MODE raised by
     ZCL_WF_EXIT===================CP in line 8  with text: Message E ZWF 000
     cannot be processed in plugin mode HTTPS"

"MESSAGE_TYPE_X_TEXT"
"CL_SWF_RUN_WIM_LOCAL==========CP" bzw. CL_SWF_RUN_WIM_LOCAL==========CM0EI
"_CALL_WORKITEM_EXIT"

  241                 CATCH cx_root INTO l_root_excp.
  242 *           * the contract for the method event_raised of workflow exit classes
  243 *           * states that it must NOT raise any exceptions other than defined in
  244 *           * the inteface. If it does so anyhow, we dump to prevent inconsistencies
  245 *           * further down
  246                   l_text = lcl_utils=>prepare_message_x_text( l_root_excp ).
>>>>>                   MESSAGE l_text TYPE 'X'.
  248               ENDTRY.

   45 METHOD       CL_SWF_RUN_WIM_LOCAL==========CP    CL_SWF_RUN_WIM_LOCAL==========CM0EI   247
      CL_SWF_RUN_WIM_LOCAL=>_CALL_WORKITEM_EXIT
   44 METHOD       CL_SWF_RUN_WIM_LOCAL==========CP    CL_SWF_RUN_WIM_LOCAL==========CM08V     2
      CL_SWF_RUN_WIM_LOCAL=>IF_SWF_RUN_WIM_INTERNAL~CALL_WORKITEM_EXIT
   43 METHOD       CL_SWF_RUN_WIM_EXECUTION_MGR==CP    CL_SWF_RUN_WIM_EXECUTION_MGR==CM00R    74
      CL_SWF_RUN_WIM_EXECUTION_MGR=>HANDLE_EXECUTION_RESULT
   42 METHOD       CL_SWF_RUN_WI_COMPLETE_REQUESTCP    CL_SWF_RUN_WI_COMPLETE_REQUESTCM002   122

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental." 

• SAP Business Workflow
• SAP NetWeaver
• SAP Web Application Server for SAP S/4 HANA
• ABAP PLATFORM - Application Server ABAP

WF_GDPR, SWF_WORKFLOW, WFMSTD, CX_SY_MESSAGE_IN_PLUGIN_MODE, dynpdext.c, CALL_WORKITEM_EXIT, Message cannot be processed in Plugin mode HTTPS  , KBA , BC-BMT-WFM , Business Workflow , CA-INB-FIO , Fiori UI for My Inbox Application , OPU-BSC-TGW-BWF , SAP Business Workflow Provider , OPU-BSC-TGW , Task Gateway , Problem