Unable to select target parameter of Vst (pre4)

Reaper version: 6.10 - 6.12
Realearn version:

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How to reproduce:

create a new track, add Realearn and a Vst plugin (testing with freeware Tal-Flanger: https://tal-software.com/products/tal-effects)
add a new mapping, press “learn target” and move a knob on the plugin

The parameter is not detected.

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Press “edit” and select the Vst in the “FX” dropdown

The following error appears:

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--- cut ---
Message: Couldn't format normalized value: ReaperFunctionError { message: "couldn\'t format FX parameter value (FX maybe doesn\'t support Cockos extensions or FX or parameter doesn\'t exist)" }

   0: Extended
   1: Extended
   2: MAIN
   3: Extended
   4: Extended
   5: rust_eh_personality
   6: rust_eh_personality
   7: MAIN
   8: MAIN
   9: NSEEL_HOSTSTUB_EnterMutex
  10: NSEEL_HOSTSTUB_EnterMutex
  11: NSEEL_HOSTSTUB_EnterMutex
  12: MAIN
  13: MAIN
  14: MAIN
  15: MAIN
  16: Run
  17: <unknown>
  18: <unknown>
  19: <unknown>
  20: <unknown>
  21: PeekMessageW
  22: IsWindowRedirectedForPrint
  23: UnpackDDElParam
  24: DispatchMessageW
  25: DispatchMessageW
  26: <unknown>
  27: <unknown>
  28: BaseThreadInitThunk
  29: RtlUserThreadStart
--- cut ---

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Select a parameter from the “parameter” dropdown (“7-FEEDBACK” in my case)

The following error raises:

--- cut ---
Message: Couldn't format normalized value: ReaperFunctionError { message: "couldn\'t format FX parameter value (FX maybe doesn\'t support Cockos extensions or FX or parameter doesn\'t exist)" }

   0: Extended
   1: Extended
   2: MAIN
   3: Extended
   4: Extended
   5: rust_eh_personality
   6: rust_eh_personality
   7: MAIN
   8: MAIN
   9: NSEEL_HOSTSTUB_EnterMutex
  10: NSEEL_HOSTSTUB_EnterMutex
  11: NSEEL_HOSTSTUB_EnterMutex
  12: MAIN
  13: MAIN
  14: MAIN
  15: MAIN
  16: Run
  17: <unknown>
  18: <unknown>
  19: <unknown>
  20: <unknown>
  21: PeekMessageW
  22: IsWindowRedirectedForPrint
  23: UnpackDDElParam
  24: DispatchMessageW
  25: DispatchMessageW
  26: <unknown>
  27: <unknown>
  28: BaseThreadInitThunk
  29: RtlUserThreadStart
--- cut ---

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The parameter is selected on the “Edit mapping” window, but on the main Realearn interface, another parameter is selected (“2-SPEED” in my case)

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Close the mapping window with OK
Press “Edit” again to re-open the mapping window

The error appears again and the “Edit mapping” window doesn't open

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Press “Edit” again (now the “Edit mapping” window opens)

The parameter in the “Edit mapping” changed to the one (wrong) that is on the main Realearn interface (“2-SPEED” in my case)

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Press “Learn” in the “source” section to map the controller

The “Learn” button stays on “Learn” instead of switching to “Stop learning”

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Move a knob on the controller

The controller is registered on the main Realearn interface, but not on the “Edit mapping window”

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Notes:

The workflow above works correctly with the old Realearn (i.e. non-Reapack)
Attached a bare-minimal Reaper project to test the behavior

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