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.