This appears to be a bug that was introduced in cPanel 11.32.
I have tested this with 126.96.36.199.
If an account is over it's quota limit and you suspend the account, the .htaccess file for the account's DocumentRoot does not get properly created and suspension redirection does not take place. Apparently the process tries to create the .htaccess file as the account owner, which does not have enough quota room available to create files.
Testing this with cPanel 11.30 (188.8.131.52) does not show the same results. With cPanel 11.30 the .htaccess file is created properly even if the account is over its quota limit at the time of suspension.