Downgrading issues from v3 to v2

Since upgrading to v3 turned into 2 weeks nightmare, I decided to downgrade to v2. What I did so far:
composer update
removed "node_modules" & executed "sudo npm install"
php artisan optimize:clear


Unfortunately this was not enought and I have broken UI of the app:
  • logo missing
  • main content is over the left menu
  • missing user menu items
  • edit modals X misplaced and many more UI gliteches
Should I run something else, so this could be cleanly downgraded?
I'm using GIT so this branch is purely v2 - no changes from v3, neither automated, neither custom

P.S. Note that my production app, based on the same branch is OK, so it should be something local.
Solution
What helped was npm run build. It seems that I had to rebuild.
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