HI. @Brian I had the same issue as everyone above, through desperation I had to solve it, FAST!.
Here is the solutions.
Step 1, Make sure the <div id="preloader"></div>
is inside the v3d-container div.
Step 2, build this init puzzle shown in the attached screenshot
Make sure, NOT to set on start, and uncheck in parent document. These were holding it back, as this would work, if you built the page to consider outside preloaders, however, if the preloader is built in the v3d html template, it will revert and be interrupted by various other head or footer scripts from wp / divi / elementor etc etc.
Keep it inside v3d as much as possible, and it creates less scenarios and complexities.
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