Did you ever resolve this? Having same issue with Elementor. Worked on HTTP but on HTTPS with CloudFlare, it never finishes loading the editor. Hopefully they resolve this ASAP.
Very strange.
In the WP-Piwik settings, the “http://” had been stripped off the Piwik URL on each site this is installed on. Once I added it back in, the code is fine.
I’ll let you know if I experience it again somehow.
Thanks!