pods_api_pre_save_pod_item is not triggered when saving Pod

[paddelboot]

Describe the bug
pods_api_pre_save_pod_item is not triggered when saving a Pod item in the WP admin. Instead, the filter is called when I save a regular post/page type. I used the more specific pods_api_pre_save_pod_item_{pod} which doesn't work either. There seem to be some issue reports about this over the years, but apparently it hasn't been fixed, therefore my new report.

To Reproduce
I. Create Pod.
II. Add filter to your functions.php or plugin file.
III. Filter function will never be triggered.

Expected behavior
Have the filter work.

Pods Version

2.7.9

WordPress Environment

``` WordPress Version: 4.9.8

PHP Version: 7.2.12-1+ubuntu16.04.1+deb.sury.org+1

MySQL Version: 5.7.24

Server Software: Apache/2.4.37 (Ubuntu)

Your User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Session Save Path: /var/lib/php/sessions

Session Save Path Exists: Yes

Session Save Path Writeable: Yes

Session Max Lifetime: 1440

Opcode Cache:

Apc: No
Memcached: No
OPcache: Yes
Redis: No

Object Cache:

APC: No
APCu: No
Memcache: No
Memcached: No
Redis: No

WPDB Prefix: nx24_2_

WP Multisite Mode: Yes

WP Memory Limit: 64M

Pods Network-Wide Activated: Yes

Pods Install Location: /media/Entwicklung/Entwicklung.xxx/www/v2/wp-content/plugins/pods/

Pods Tableless Mode Activated: No

Pods Light Mode Activated: No

Currently Active Theme: xxx Interface Theme

Currently Active Plugins:

xxx Interface: 1.0.1
Panda Pods Repeater Field: 1.3.1
Pods - Custom Content Types and Fields: 2.7.9

</details>

## Pods Package Export (helpful!)
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<!-- To access: Pods Admin, Components, Migrate: Packages, Enable. -->
<!-- Then Pods Admin, Migrate: Packages, Export and Copy and Paste the JSON here OR -->
<!-- Save to a text file and upload to this bug report -->

Copy and Paste the JSON Export from Pods Admin, Migrate: Packages, Export in WordPress admin here

[paddelboot]

I found out that the filter is not called in my app when I use a router. On the other hand, it is called when I just add it in the bootstrap file, which is loaded before the routing takes place. Might be an issue with my app after all, I'll keep looking into it.

[paddelboot]

This is absolutely weird. I have a class PodsFilterListener:

class PodsFilterListener implements Listener {

  public function attach() {

      add_filter( 'pods_api_pre_save_pod_item_einstellungen', array( $this, 'MapFileTypeFields' ), 999, 2 );
  }

  public function MapFileTypeFields(){}
}

This code works:

$PodsListener = new pci\Presentation\Listener\PodsFilterListener();
$PodsListener->attach();

switch ( $routeInfo[ 0 ] ) {

   case \FastRoute\Dispatcher::FOUND :
    ....

The pods_api_pre_save_pod_item_{pod} filter that is added in $PodsListener->attach() is triggered correctly.

This code doesn't work:

switch ( $routeInfo[ 0 ] ) {

   case \FastRoute\Dispatcher::FOUND :
   $PodsListener = new pci\Presentation\Listener\PodsFilterListener();
   $PodsListener->attach();

The filter is added, but it never triggers. I understand this might be more of a problem with my app/code than with pods, I just don't see any logical explanation, since $PodsListener->attach() is correctly executed in both cases.

[th-santos]

Similar to: #5254