I just reproduced the issue and found a workaround. You will need to edit the installdir/apps/typo3/conf/httpd-prefix.conf file and add the "Alias /typo3conf" lines there. The file should look like this after editing it
SetEnv TYPO3_PATH_APP "/opt/typo3-9.5.5-1/apps/typo3/htdocs/public"
SetEnv TYPO3_PATH_ROOT "/opt/typo3-9.5.5-1/apps/typo3/htdocs/public"
Alias /typo3/ "/opt/typo3-9.5.5-1/apps/typo3/htdocs/public/"
Alias /typo3 "/opt/typo3-9.5.5-1/apps/typo3/htdocs/public"
Alias /typo3conf/ "/opt/typo3-9.5.5-1/apps/typo3/htdocs/public/typo3conf/"
Alias /typo3conf "/opt/typo3-9.5.5-1/apps/typo3/htdocs/public/typo3conf"
Please note that
/opt/typo3-9.5.5-1 is the installation directory I selected. After that, you will need to restart Apache
sudo installdir/ctlscript.sh restart apache
I'll forward this information to our Engineering team so they can review this and update the solution if needed.