system_path error on password resets

I migrated and updated an EE 2 site to version 6.0.6. Everything went well and it appeared to work. I do rename the system folder, let’s say to “app_system”. I changed the $system_path value in the root index.php and admin.php file to have this.

$system_path = './app_system'

The site appears to work fully and users can access the Control Panel.

However, when someone tries to do a password reset, the reset link they receive via email returns this when loaded:

“Your system folder path does not appear to be set correctly. Please open the following file and correct this: index.php”

It’s loading */app_system/index.php?S=0&D=cp&C=login&M=reset_password&resetcode=xyz

I looked at /app_system/index.php and I haven’t changed the system_path there as I’ve never had to.

Should it be changed there? I tried both “./app_system” and “../app_system” and the reset link still returns the same error. I don’t think this is the problem though because I’ve never had to change it before.

Is it a permissions problem? If so which file or folder needs to be changed? I did review the installation page and tried a couple permissions tweaks but that hasn’t helped.

I do have an htaccess rewrite too so I suppose that could be the culprit but I would expect problems there to show up elsewhere.

Thank you!