TYPO3 Core

I think the new fileending .tsconfig should be in the access block list in the .htaccess file.

# Access block for files
# Apache < 2.3
<IfModule !mod_authz_core.c>
    <FilesMatch "(?i:^\.|^#.*#|^(?:ChangeLog|ToDo|Readme|License)(?:\.md|\.txt)?|^composer\.(?:json|lock)|^ext_conf_template\.txt|^ext_typoscript_constants\.txt|^ext_typoscript_setup\.txt|flexform[^.]*\.xml|locallang[^.]*\.(?:xml|xlf)|\.(?:bak|co?nf|cfg|ya?ml|ts|typoscript|tsconfig|dist|fla|in[ci]|log|sh|sql(?:\..*)?|sqlite(?:\..*)?|sw[op]|git.*)|.*(?:~|rc))$">
        Order allow,deny
        Deny from all
        Satisfy All
    </FilesMatch>
</IfModule>
# Apache ≥ 2.3
<IfModule mod_authz_core.c>
    <If "%{REQUEST_URI} =~ m#(?i:/\.|/\x23.*\x23|/(?:ChangeLog|ToDo|Readme|License)(?:\.md|\.txt)?|/composer\.(?:json|lock)|/ext_conf_template\.txt|/ext_typoscript_constants\.txt|/ext_typoscript_setup\.txt|flexform[^.]*\.xml|locallang[^.]*\.(?:xml|xlf)|\.(?:bak|co?nf|cfg|ya?ml|ts|typoscript|tsconfig|dist|fla|in[ci]|log|sh|sql(?:\..*)?|sqlite(?:\..*)?|sw[op]|git.*)|.*(?:~|rc))$#">
        Require all denied
    </If>
</IfModule>