When performing a media search in the editor, what the browser essentially does is calling https://slashedbeauty.com/wp-json/wp/v2/media?search=<searchterm>
. This is WordPress’ built-in REST API for media items. For some reason, searching for media items is not working on your site.
For example, https://slashedbeauty.com/wp-json/wp/v2/media?search=magnetic should return the contents https://slashedbeauty.com/wp-json/wp/v2/media/19127 (image https://slashedbeauty.com/wp-content/uploads/2021/06/magnetic-lash-review-video-thumbnail.jpg) but it’s simply empty.
So there’s clearly something off with your site’s setup.
Since you mention this also happens in Troubleshooting mode with all other plugins disabled, I feel like there’s only two options left:
1. Use a different theme in Troubleshooting mode (e.g. Twenty Twenty
2. Reach out to your hosting provider regarding this issue with the REST API. Perhaps there are some security measures implemented or something.