I had the problem once with a comments component plugin that did not execute on my Seblod content. After going through the following steps I got it working.
Did you check the settings in the configuration tab of your list&search type?
There is one that says "Prepare content".
Also if you want to run the plugin inside a module, in the module configuration there also is a prepare content setting.
This determines whether Joomla plugins should be executed on the content.
If you are using custom template or position overrides, you need to include something like:
<?php echo $this->item->event->afterDisplayContent; ?> or <?php echo $this->item->event->beforeDisplayContent; ?>
in your override php.