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[Waiting for user confirmation] Saving widgets shows a critical error message
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Elementor users - please update WPML to the latest version to maintain compatibility. More details here - https://wpml.org/changelog/2024/12/wpml-4-6-15-critical-update-for-elementor-sites/
Thank you for your patience and cooperation. I couldn't reproduce the issue in a fresh installation, even I added your JSON based ACF fields to my test site.
So I've escalated the matter to our 2nd tier team, with a backup of your site. I'll update you as soon as I have more information. Please keep the staging site active and accessible.
Our team analyzed that there are lot of inactive widgets in Appearance -> Widgets which appeared to use formerly registered ACF blocks that were no longer available, and that is what was causing problems trying to save the widgets page.
So they deactivated ACFML and String Translation and were able to expand the inactive widgets section. Then deleted these one by one. And now the active widgets can be saved without any problem.
We've tested this in your staging site. I request you to try this in your site after taking a full backup and let me know your findings.