Bug "Cannot find Action Map 'Player' in actions '...inputactionasset'

I renamed the default player map from 'Player' to 'Walking' in my inputactionasset.
I double-checked that the PlayerInput instance knew the new name, and the Inspector showed it switched automatically to 'Walking'.

I start Play, and the keyboard responds correctly but the mouse fails to have any effect, and the console shows:

Cannot find action map 'Player' in actions 'GenericPlayerInputs (UnityEngine.InputSystem.InputActionAsset)'
UnityEngine.InputSystem.PlayerInput:OnEnable () (at Library/PackageCache/com.unity.inputsystem@1.4.4/InputSystem/Plugins/PlayerInput/PlayerInput.cs:1619)

The source code line in PlayerInput does not obviously have a reference to the old name 'Player'.

Code (CSharp):

1.             using (InputActionRebindingExtensions.DeferBindingResolution())
2.             {
3.                 AssignPlayerIndex();
4.                 InitializeActions();
5.                 AssignUserAndDevices();
6.                 ActivateInput();       << line 1619
7.             }
8.  

If I rename the action map back to 'Player' everything works again.

 

I have the same issue. Has anyone a solution.

 

Same problem, bumping