inlinemod_dodeleteposts hook is not working

[squishi]

I have added this in a plugin for the "inlinemod_dodeleteposts" hook:

PHP Code:

die('test'); 


The plugin is active and should be executed when the respective line is reached in inlinemod.php.

However, the plugin is not being run. The execution of the code is not interrupted, the plugin is not executed.
If I add the code below or above the hook line in inlinemod.php, I get the expected result.

So the hook must be disfunctional in vb3.8.7 Patch 2. How can I fix it?