Temp dir configuration moved to setting for Drupal 8.8+

The site I'm working with does not specify anything in the settings.php regarding /tmp and I was getting this error message. (I installed the site using a custom template's custom db installation)

So, the "change record" has no relevant information for me.

Following the accepted answer on the Drupal Answers page and using Drush to update this value just results in a *different* error report:

You are using deprecated configuration for the temporary files path. Your temporary directory configuration matches the OS default and can be safely removed.

Not a very helpful solution. This is currently broken and uncorrectable for anyone who doesn't know what "deprecated configuration" this error message is talking about. If it found something, it should say what it found and how to fix it, not just some vague reference to "deprecated configuration". In my case, for example, there is no visible "configuration" to remove.

Also, what's going on with the Version selection on this issue screen? It doesn't allow specifying anything above version 7.

Note that the closing SEMICOLON is missing in the suggested text which shows up in the Status Report after you upgrade to 8.8.1

$settings['file_temp_path'] = '../temp-stuff';

Once you have upgraded to 8.8.x you cannot "remove" the previous configuration (?), so I don't understand why that is suggested.

I strongly recommend you add this to settings.php BEFORE you attempt to upgrade from 8.7.x to 8.8.1

frustrating that D8.8 breaks things. you'd think temp folder would be fleshed out by now.

THe message is incorrect - I think suggesting double quotes vs singles quotes and not ending the string with a semicolon... (for those that copy/paste)

Then for the fools who follow instructions like me - it fails. It shows in my files settings as still set to /tmp. A previous comment suggests after upgrading from 8.7 to 8.8 you're not able to make this change for some reason. I can't get it to work anyways with no amount of tweaks to string, folder or rights. Seems even editing your sites settings files doesn't allow change to the /tmp path after the fact.... this in turn breaks CSS Aggregate cache to name something obvious. I know it's not nice to bash but ... really?

I solved this way (CentOS 8, D8)
selinux is disabled :(
do not disable selinux, turn this on after config and test
in my settings.php

/**
 * Private file path:
 */
$settings['file_private_path'] = '/var/www/drupal_priv_files';

/**
 * Temporary file path:
 */
$settings['file_temp_path'] = '/tmp/';

Important:
1. File path is absolute to host filesystem
2. this dirs are *outside drupal root and apache www docroot*

Permissions is
rwx r-x r-x apache:apache for private /var/www/drupal_priv_files dir
rwx rwx rwx root:wheel for /tmp dir

I think a recent patch will solve it by changing the D8 settings template.

see: https://git.drupalcode.org/project/provision/-/commit/aa1275b577970f6ff7...