[VS Code ext][Bug] Parameters file not loaded in deployment pane

**Bicep version** VS code extension 0.43.8 **Describe the bug** When I picked a JSON parameters file in the deployment pane, the fields are not populated with the values from the file. Therefor I get this error when I do not provide the values manually: 'The value for the template parameter 'XXX' at line '1' and column 'XXX' is not provided. Also there is no information in the output window mentioning the loading of the file. No Success or Error. Nothing **To Reproduce** 1. Right click a bicep file with parameters and click Generate Parameters File 2. Choose bicepparams ( not JSON !!, see bug #19696 ) 3. Choose required only ( to be sure all required values are provided when testing this bug ) 4. Right click the generated bicepparams file 5. Click build parameters file 6. Open the generated parameters.json file 7. Fill all the values ( as they are all required ) 8. Save the file 9. Right click the bicep file 10. Click Show deployment pane 11. In the deployment pane click Pick JSON parameters file 12. Choose the parameters.json file saved in step 8 13. Click Validate or What-If 14. Enjoy the error message