What happened?

1. Link two plugins with a script.php file into the correct joomla directory in the plugins folder
2. Discover install the extensions

Version

5.4

Expected result

Both script files are executed.

Actual result

Only the first one

System Information

Joomla 5

Additional Comments

I discovered it, while installing multiple extensions in DPDocker. The fix is to replace the line 950 in the file libraries/src/Installer/InstallerAdapter.php from:
$manifestScriptFile = $this->parent->getPath('source') . '/' . $manifestScript;
to
$manifestScriptFile = $this->parent->getPath('extension_root') . '/' . $manifestScript;

The 'source' path was still pointing to the first installed plugin on the second one. I'm not sure how to correctly fix it, but this one worked.