I have found a reason – in your specific configuration – with disabled Pretty URLs and when tag pages have no prefix, your problem appears. It will be solved in v.0.38.2 🙂
Additionally I have found another issue where settings regarding noindex for pagination were ignored and Publii always generated pagination URLs for your configuration, regardless of the pagination indexation settings.
Do you appreciate the support you've received today? If so, consider donating to the Publii team by clicking here; we'll be sure to use your donation to make Publii even better!