A subsequent hotfix is available to fix the cleanup of the T_ITEM_LIST table -
CM_9.1.0.21116. Hotfixes CM_9.1.0.19535 and
CM_9.1.0.20295 are prerequisites for this hotfix. The hotfixes are available via FTP as per:
Where can I find hotfixes for SDL Tridion Sites/Web?Tridion Sites 9.5 has a hotfix for the cleanup portion (prerequisites are already a part of this version:
CM_9.5.0.21116.