When I select a custom field (Select List with Multiple Options) to filter issues, none of the options are available for tasks and subtasks.
When those two issue types are excluded, the custom field values are populated.
When I create a JQL query using the custom field, the task and subtasks are correctly filtered, but switching back to basic view generates an error saying that field value isn't for the issue type... but it is.
Attached image. Additionally, attempted in Chrome 81.0.4044.138 and Firefox 76.0.1.
