WordPress 5.5 and JS issue

Thank you for reporting the issue @noche70! I’ve opened an issue on GitHub to address this in the next release.

Same here. This is what I got —

jQuery Migrate Helper — Warnings encountered
This page generated the following warnings:

https://example.com/wp-content/plugins/stream/ui/js/admin.min.js: jQuery.fn.load() is deprecated
Please make sure you are using the latest version of all of your plugins, and your theme. If you are, you may want to ask the developers of the code mentioned in the warnings for an update.