Hello. Thank you for contacting the Toolset support.
Yes - Toolset is not fully compatible with PHP 8 currently and this is known to us and our devs are reviewing the situation.
We already added the note within the section "Important notes:" on our requirement Doc:
- https://toolset.com/toolset-requirements/
PHP 8 is currently not supported due to some issues. We’re working on fixing this. In the meantime, please use PHP 7 version.