Compiler crash in the presence of semantic-db flag

[Quafadas]

In advance: I didn't write this code and I'm not a confident user of the scala compiler. But this behaviour was perplexing for me.

Compiler version

3.3.1

Minimized code

trait Accumulator[T <: BigInt | BigDecimal] {
  def observe(n:T):Accumulator[T]
  def observe(bi: BigInt): Accumulator[T]
}

class DiscreteAccumulator extends Accumulator[BigInt] {
  override def observe(bi:BigInt):DiscreteAccumulator = ???
}

Output (click arrow to expand)

As part of the sbt project. I see this.

sbt:slash> compile
[info] compiling 56 Scala sources to /Users/simon/Code/vector/slash/js/target/scala-3.3.1/classes ...
[info] compiling 56 Scala sources to /Users/simon/Code/vector/slash/native/target/scala-3.3.1/classes ...
[info] compiling 58 Scala sources to /Users/simon/Code/vector/slash/jvm/target/scala-3.3.1/classes ...

  unhandled exception while running extractSemanticDB on /Users/simon/Code/vector/slash/shared/src/main/scala/slash/accumulation/Accumulator.scala

  An unhandled exception was thrown in the compiler.
  Please file a crash report here:
  https://github.com/lampepfl/dotty/issues/new/choose

     while compiling: <no file>
        during phase: <no phase>
                mode: Mode(ImplicitsEnabled,ReadPositions)
     library version: version 2.13.10
    compiler version: version 3.3.1

When I minimise with scala-cli, I get this - which I believe to be the same thing.

If this code is copied into a file named "acc.scala"
scala-cli compile acc.scala - success

scala-cli compile /Users/simon/Code/vector/slash/shared/src/main/scala/slash/accumulation/Accumulator.scala -O semantic-db - compiles fine, which makes me doubt whether or not this is really a compiler bug.

scala-cli compile acc.scala --semantic-db - error

Error compiling project (Scala 3.3.1, JVM (21))
Error: Unexpected error when compiling accumulation_09379ba6b4-4d2c52f5ef: 'Failure to disambiguate overloaded reference with
  method observe in trait Accumulator: (bi: BigInt): slash.accumulation.Accumulator[T]  and
  method observe in trait Accumulator: (n: T): slash.accumulation.Accumulator[T]'
Compilation failed

[sjrd]

Tentatively assigning @tanishiking based on https://github.com/lampepfl/dotty/blob/main/MAINTENANCE.md#tooling