Scala 3: No given instance of type cats.Applicative[[_] =>> Any] was found for parameter F of method apply in class PurePartiallyApplied

[froth]

I am currently migrating code from scala 2.13 to Scala 3 and found a weird issue. I am not sure whether this is a bug or not. And also sure whether it should be reported here or on http4s. Opening to be sure:

The following code compiles under scala 2.13:

import org.http4s.server.AuthMiddleware
import cats.data.Kleisli
import cats.data.OptionT
val middleware = AuthMiddleware(Kleisli { _ => OptionT.pure { "foo" } })

But reports compile errors under scala3:

[error] -- [E172] Type Error: /tmp/quickstart/src/main/scala/com/example/quickstart/Main.scala:12:71 
[error] 12 |  val middleware = AuthMiddleware(Kleisli { _ => OptionT.pure { "foo" } })
[error]    |                                                                       ^
[error]    |No given instance of type cats.Applicative[[_] =>> Any] was found for parameter F of method apply in class PurePartiallyApplied
[error]    |
[error]    |One of the following imports might make progress towards fixing the problem:
[error]    |
[error]    |  import fs2.Compiler.Target.forConcurrent
[error]    |  import fs2.Compiler.Target.forSync
[error]    |
[error] -- [E172] Type Error: /tmp/quickstart/src/main/scala/com/example/quickstart/Main.scala:12:74 
[error] 12 |  val middleware = AuthMiddleware(Kleisli { _ => OptionT.pure { "foo" } })
[error]    |                                                                          ^
[error]    |No given instance of type cats.Monad[[_] =>> Any] was found for an implicit parameter of method apply in object AuthMiddleware
[error]    |
[error]    |One of the following imports might make progress towards fixing the problem:
[error]    |
[error]    |  import fs2.Compiler.Target.forConcurrent
[error]    |  import fs2.Compiler.Target.forSync
[error]    |

The following variant compiles under scala 3:

val response: Kleisli[OptionT[IO, *], Request[IO], String] = Kleisli { _ => OptionT.pure { "foo" } }
val middleware = AuthMiddleware(response)