Oh, no, they were broken even before this. Welp. looks like I'll be fruitlessly trying to bisect that today.

• ❌ cf5dc28 (before Change TAEF nuget package to use new Microsoft.Taef name; Update to 10.58 release build version. #9656)
• ✔️ 690fbbb (before defterm)
• ❌ 906edf7 (defterm)

It was definitely defterm

Originally posted by @zadjii-msft in #9656 (comment)