The 'View webform submissions for own node' permission allows a role to view submissions, but the downloaded result set is empty

I got into this issue too and after a bit of debugging i found that the cause could be the query access check set to TRUE by default in WebformSubmissionExporter class (at line 298, used then at line 958).
A quick and dirty solution is to add a line of code in the WebformResultsExportController controller

$default_options['access_check'] = FALSE;

right before line 105.
I think that an user that has already access to that interface should be able to download all the submissions listed but i'm not sure if this could have some unwanted side effects.

@maurizio.ganovelli

This was my inclination as well when I reviewed the code. I've created a patch for anyone who wants to try this solution.

Hi droath, thank you, your patch is the same i applied locally. I have been using it in a production environment for months and have not encountered any errors or malfunctions yet.