Can not update posts WP 5.5.3

Hi! There isn’t enough information about the problem, try to figure out if there is some script related problem occurs when you are trying to save this post:

Using Your Browser to Diagnose JavaScript Errors

Here are mentioned some common issues with scripts in 5.5 version and what can be done:
https://github.com/wpmarketingteam/WP5.5/blob/main/Q%26A%20for%20non-technical%20users.md#section-8-jquery

Check if you have all plugins and theme updated, you can also try to switch plugins off to see if one of them is causing this. If this will be the case, you can contact this plugin’s support to get it solved.