BUG: Typoscript settings are removed in be module when using ExtensionManagementUtility::addTypoScriptSetup

[rupasix]

I have checked that the bug exists in the dev-development branch
Yes

I have checked that there are no already open issues or recently closed issues about this bug
Yes

Describe the bug
We use code in file ext_tables.php of EXT:testext :

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addTypoScriptSetup(
    '<INCLUDE_TYPOSCRIPT: source="FILE:EXT:testext/Configuration/TypoScript/Backend/setup.typoscript">'
);

and setup.typoscript contains

module.tx_testext {
	settings {
		test = 123
	}
}

Those settings are not available in be module actions when current EXT:flux (93241db6e5d0fcc00fc092b5926052786d5be82f) is installed

To Reproduce
Steps to reproduce the behavior:

1. Create ext with be module,
2. Use AddTypoScriptSetup in ext_tables.php to add typoscript with module settings
3. Try to debug $this->settings in action of be module

Expected behavior
I want to use my settings in be module