Steps to reproduce

1. Create an item with two statements using different properties (for example, P1 and P2).
2. Update the MediaWiki:Wikibase-SortedProperties page specifying properties in the opposite order.

For example,

* P2
* P1

3. Go back to the item and try to purge the page (either with ?action=purge or via Special:Purge) or update it.

Result

The order of the statements on the page in most cases remains the same. Going back on the page and purging it later may suddenly force changes take effect.

Expected Result

After the purge or page edit, the statements on the page are ordered as prescribed on the SortedProperties page.

This is potentially the problem that causes a lot of frustration here: T364744