jstree is now shipped with the bundle and reactstrap is no longer used: the
edit forms rely on the Bootstrap markup already provided by the Ibexa back
office.
If you previously added jstree and/or reactstrap to your project as a
workaround for the webpack build failure, remove them and rebuild your assets:
yarn remove jstree reactstrap
php bin/console ibexa:encore:compileDepending on your project setup, the back-office assets may be compiled by a
dedicated script instead (e.g. yarn ibexa:dev).