[TYPO3-english] TSConfig isn't loaded when included in extTables.php

[Jan Kornblum]

Dear newgroups,

in TYPO3 6.2.14 LTS i've got a strange behaviour: I load some TSConfig 
using...

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig('');

...and...

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addUserTSConfig('');

in typo3conf/extTables.php. But this doesnt work reliable. E.g., when a 
content element is opened, the RTE configuration (set as above) is 
correctly loaded, but after saving the ce once, the configuration isn't 
loaded anymore.

It doesn't make any difference if the TSConfig is directly passed to 
addPageTSConfig('...some config here...') or if the TSConfig is set as 
a file reference like addPageTSConfig('<INCLUDE_TYPOSCRIPT: 
source="FILE:some_file.txt">').

The only thing that works is, including the TSConfig directly (or as 
file reference) in page properties or usergroup properties.

Is there anything to take special care about when setting TSConfig as 
mentioned above directly in extTables.php? On any other installations 
this always used to work fine.

Kind regards, Jan