I ran into a problem with one of my websites after updating from Drupal 8.7.3 to Drupal 8.7.4 and again updating from 8.7.4 to 8,7.5. Trying to open either of the webforms on that site resulted in a "page not found" error. After saying a few bad words, but before I restored the site from a backup, I decided to flush the caches. The webforms then worked properly.
Since having this problem, I have been clearing caches even on sites that don't use the Webform module as a precaution.