Donation Block Missing After Downgrading from Atomic to Simple

### Impacted plugin

Jetpack

### Quick summary

I was working with this user, 9324533-zd-a8c, and they requested to downgrade from the Business Plan to Premium.

When I downgraded their website from Atomic to Simpl (_using lossless import_), the Donation Block stopped appearing on the site (https://warmreads.com/become-a-patron/). The Donation Block is visible on the editor, but not on the live site.

**Editor view after reverting to Simple:**


**Live site view when the website was Simple:**


The issue persists even when creating new pages and re-adding the block after the downgrade.

**Expected Behavior:**
The Donation Block should be available and functional on all plans. This is what appears only when website is Atomic:


### Steps to reproduce

These should be the steps, but I couldn't replicate this on my setup:

1. Start with a website on a Business Plan (atomic).
2. Add a Donation Block to any page.
3. Downgrade the plan to Premium (simple).
4. Observe that the Donation Block no longer appears on the live site.

### Site owner impact

Fewer than 20% of the total website/platform users

### Severity

Moderate

### What other impact(s) does this issue have?

Agency or developer revenue

### If a workaround is available, please outline it here.

**Additional Information:**

- The issue was specific to the user’s site and could not be replicated on a test site with the same downgrade process.
- The user’s site uses a custom theme, but it is also available on the Premium Plan. No plugins are being used that would interfere with the block.
- Restoring the Business Plan and a previous backup made the Donation Block reappear on the site.

### Platform (Simple and/or Atomic)

Simple

No source file or test is named, and the report says the issue could not be reproduced on a test site. Start by reproducing the Atomic-to-Simple downgrade with lossless import, then compare Donation Block availability in the editor and on the live site. Done means the block renders and functions on a Simple site after downgrading.

Written by the indexing model from the issue text.