Repair Elementor Editor Loading Issue

My Elementor Pro editor hangs on the infinite “Loading…” screen every time I try to open it. Front-end pages render fine, but the back-end editor never gets past the spinner. I traced the problem to a custom SPA-cache script that lives in mu-plugins and seems to have corrupted Elementor’s normal load sequence.

Here’s the full picture:
• Issue: editor is stuck loading (no save or preview possible because the panel never appears).
• Moment it happens: immediately when I open the editor.
• Recent changes: none—I haven’t added or updated any other plugins, so the conflict is almost certainly tied to that SPA-custom cache code.
Requirement :
you must great at using docker yml , understanding multistack architecture . because my stack is multistack architecture.
What I need from you:
1. Pinpoint the exact conflict between the mu-plugin cache and Elementor Pro / Elementor.
2. Cleanly patch or refactor whatever is blocking the editor, without breaking front-end caching behaviour.
3. Confirm that the editor loads quickly, saves, and previews normally after the fix.

WordPress, Elementor, Elementor Pro, PHP debugging, and mu-plugin experience will be essential. If you can jump in, isolate the snag, and get the editor working today, let’s do it.