The Soil plugin is not compatible with the new editor in WordPress 5.0+. When you try to edit a post all you get is a white screen.
After some troubleshooting I have found that the problem is related to add_theme_support(‘soil-clean-up’);
More specific it appears the problem is in modules/clean-up.php code that Cleans up the output of <script> tags. Removing add_filter('script_loader_tag', __NAMESPACE__ . '\\clean_script_tag'); resolves the issue.
I found the same issue on a fresh install with 2019 theme and plugin version 3.7.1 . I checked https://roots.io/plugins/soil/ but I don’t see the latest version number listed. Maybe it is an older version of the plugin, which would explain why you can’t replicate the issue?
edit: I’ll also be updating the Soil plugin page on the Roots site to list the latest version and last updated date — sorry about that! This was previously there, but I must have missed it when re-doing templates for the new site last year