A bit of background Even as a seasoned Drupal developer, when upgrading a Drupal 10.x site to Drupal 11.x you can still encounter a number of weird issues with some older legacy code on the site, which had previously (unbeknownst to you) relied on functionality that has now changed in some way, shape or form due to the upgrade to Drupal Core and its dependencies. I've just gone through a long morning of debug hell...
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#Drupal Planet
#Drupal 11
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#jquery
#Modern Drupal
#Migrate