Using @JsonCodec + Scala 2.13.2 + sbt-tpolecat doesn't report unused imports

[GuillaumeSaintRaymondSonos]

Here is a sample project reproducing the problem: https://github.com/GuillaumeSaintRaymondSonos/sbt-tpolecat-circe/ where I left an unused import in Hello.scala. The compiler doesn't report anything.
By downgrading to Scala 2.13.1, the compiler reports correctly the unused import.

I opened the issue first on the sbt-tpolecat repository.
I'm not 100% sure the problem comes from circe but I would appreciate greatly if I can have your point of view on this.

[SethTisue]

note that scala/scala#8799 may be relevant

[GuillaumeSaintRaymondSonos]

Tried today with Scala 2.13.3, unused import is reported !