Plesk environment: I am running into issues with the unserialization and cron

[leganzaro]

In the list of issues for OpenMage, I didn't find any of these problems so I suspect Plesk as the primary culprit.
I have installed OpenMage v20.0.10 and v19.4.13 with PHP 7.4 and I found two separate problems:

1. I run into an issue with the unserialization.

The exact error happens in:
Warning: unserialize() expects exactly 1 parameter, 2 given in ../app/code/core/Mage/Core/Model/Cache.php on line 503
Warning: unserialize() expects exactly 1 parameter, 2 given in ../lib/Varien/Db/Adapter/Pdo/Mysql.php on line 1567
Warning: unserialize() expects exactly 1 parameter, 2 given in ../app/code/core/Mage/Core/Model/Cache.php on line 614

As a solution for this case, I use @ operator and the notice will no longer be displayed.

2. Cron doesn't execute with no error message.

Adding $isShellDisabled = true; in cron.php allow cron to work but it would be best to run cron.sh and isn't running properly.

Everything was running fine in older releases, ex: v19.4.2, v19.4.1...

[kiatng]

For item 1 on unserialize(), see PR #1251, the second parameter was added to improve security. I note that you are running PHP7.4, you need to check again, because the second param was added since PHP7.0.

[leganzaro]

I reinstalled both versions v20.0.10 and v19.4.13 on a new server with clean installation of Plesk on a Centos 7. One extension was supplementary installed: Aoe_Scheduler for the second problem that was mentioned earlier. Current version of PHP is 7.4.18 (link) but the result is the same with every version (7.0, 7.1...).

With opcache.enable - off (not working as expected) and no custom or additional path to the open_basedir option, there is only one warning active:
ERR (3): Warning: unserialize() expects exactly 1 parameter, 2 given in .../app/code/core/Mage/Core/Model/Cache.php on line 503

The second problem: Cron - doesn't execute with no error message; is present for the last versions of OpenMage (v20.0.10/v19.4.13 vs v19.4.1).