saving reusable block hook

It appears the {$field}_save_pre filter hook doesn’t take effect on saving reusable blocks. I figured that it’s probably done in the REST API so I have looked at every rest related hook in the reference https://developer.www.ads-software.com/?s=rest&post_type%5B%5D=wp-parser-hook but didn’t find anything close to what I need – to filter reusable block content before saving – just like content_save_pre.

Any ideas?

Thanks.