In ddev I did a fresh install with TYPO3 13.4 LTS, Bootstrap Package 15 and also installed a sitepacke, generated on sitepackagebuilder.com for v13.4 (Beta). The installation was successful, the sitepackage is listed in the Extensions Module, but when I want to add it to the TypoScript record, it's not found there...

Is this a known bug, You're working on? Or did I miss something?