Hi!
( Just participating )
I recently had the same kind of issue, concerning the blank page. For my case, Elementor widgets weren’t also opening. But,I believe you have 2 issues, one for Jetpack, one for blank page.
Anyways, for my case, increasing the php memory limit solved that blank page issue.
The server was set the 32M by default but raised to 512MB and it was ok.
define(‘WP_MEMORY_LIMIT’, ‘512M’);
Hope it can help.
Mario 🙂