It seems that you are experiencing an issue with ZygiskNext installation on your Samsung Galaxy A6+ (a605g | a6plte) running AncientOS v6.4 with the default Magisk variant. The problem you're facing is that after installation, ZygiskNext does not function as expected, and it appears as if it was just installed without any error messages or indications of failure. Here are some steps you can take to troubleshoot and potentially resolve the issue:

  1. Check ZygiskNext and Magisk Compatibility: Ensure that the version of ZygiskNext you are trying to install is compatible with your device model and the version of AncientOS you are running. Sometimes, incompatibility between the software versions can lead to installation issues.
  2. Reboot into Recovery Mode: After installing ZygiskNext, try rebooting your device into recovery mode. Check if there are any pending system updates or if there's a need to clear cache partitions. Sometimes, a simple cache clear can resolve unseen issues.
  3. Verify Installation Files: Ensure that the installation files for ZygiskNext were not corrupted during download. Try re-downloading the files from a trusted source and attempt the installation again.
  4. Check for Conflicting Apps: Some apps, especially those that manage root access or security features, might conflict with ZygiskNext. Try disabling such apps temporarily to see if that resolves the issue.
  5. Consult Community Forums: Look for discussions on forums like XDA Developers or other Android enthusiast communities. Someone might have faced a similar issue with the same device and could provide a solution or workaround.
  6. Contact Support: If none of the above steps work, consider reaching out to the developers of ZygiskNext for support. They might provide insights specific to your issue.

Remember, when dealing with custom ROMs and modifications, it's always a good practice to backup your data to prevent any potential data loss. If you continue to face issues, you might want to consider rolling back to a stable version of your ROM or seeking assistance from a more experienced user in your community.