After updating from 7x to 8.1.1 any pipeline that uses tracking_column_type => "timestamp" fails with the error
[2023-06-16T14:37:50,485][ERROR][logstash.javapipeline ][Questions] Pipeline error {:pipeline_id=>"Questions", :exception=>#<Psych::DisallowedClass: Tried to load unspecified class: Time
tracking_column_type => "numeric" still works as expected in the existing pipelines.
Is anyone else experiencing these errors?