The main cause of environmental status effects becoming persistent was fixed in the patch, but a couple people on PC had this still happen, as well. Please email supportdos@larian.com, with a description and your latest save.
The Teller of Secrets is suppose to have a couple of unique (non-restocking) compendium books for sale. If you happen to have a save from before you first opened/entered the Hall of Secrets, please include that, as well.
You would need to transfer the save(s) to a USB flash drive first. In the Saved Data in System Storage section of the Settings menu, click Copy to USB Storage Device, select the relevant save(s) and Copy. From there you can optionally zip the save(s), then copy to email or upload to Dropbox or Google drive, etc, and provide a link.
