With the 5.5 update (lazy load) I get the same issue as enabling lazy load on jetpack not displaying the sliders.
Disabling all plugins and using 2019 theme and still can't get it to work...
Best Regards,Kristof Molnar | Kreatura Support Team
Thanks - have been fixing the errors - also used the Enable jQuery Migrate Helper from wordpress as this is no longer enabled by default in 5.5.
“With the update to WordPress 5.5, a migration tool known as jquery-migrate will no longer be enabled by default. This may lead to unexpected behaviors in some themes or plugins who run older code. This plugin serves as a temporary solution, enabling the migration script for your site to give your plugin and theme authors some more time to update, and test, their code.”
Thank you for your feedback!I'm glad that it solve your problem. If you will have any other question, feel free to ask.