I dealt with a 4x as expensive statement-of-work fixed price contract that was nearshored and then subbed out to a revolving cast of characters.
The SOW was so poorly specified that it was easy to maliciously comply with it, and it had no real acceptance tests. As a result legal didn't think IT would have a leg to stand on arguing with the vendor on the contract, and we ended up constantly re-negotiating on cost for them to make fixes just to get a codebase that never went live.
An example of how bad it was - imagine you have a database of metadata to generate downloader tasks in a tool like airflow, but instead of doing any sane groupings of say the 100 sources with 1000 files each every day into a 100ish tasks, it generated a 700,000 task graph because its gone task-per-file-per-day.
We were using some sort of SaaS dag/scheduler tool at the time and if we deployed we'd have been using 5x more tasks than the entire decades-old, 200 person person were using to date, and paid for it.
Or they implemented the file arrival SLA checker such that it only alerted when a late file arrived. So if a file never arrives it never alerts. Or when a daily file arrives a week late, you get the alert on arrival, not a week ago when it was late.