`~run` not working as expected with sbt 1.3.x

Play Version

Play 2.8.0 with sbt 1.3.4

API

Scala

Operating System

Windows 10 Pro

JDK

openjdk version "11.0.5" 2019-10-15
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.5+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.5+10, mixed mode)

Expected Behavior

1. git clone git@github.com:playframework/play-samples.git
2. cd play-samples/play-scala-hello-world-tutorial/
3. sbt
4. ~run
5. Make a change to source code
6. Recompilation is triggered when files are changed

Actual Behavior

Recompilation is not triggered.

Refreshing the browser window (= making a request to the app) does trigger recompilation, but AFAIK this should happen already when files change.

Downgrading to sbt 1.2.8 makes triggered execution work again as expected. Triggered execution for the compile task works using any version of sbt I have tried, so this issue is only about the run command with sbt 1.3.x (on Windows).

I have tried different fileWatchService implementations but the issue persists.

Start in play-samples/play-scala-hello-world-tutorial and reproduce the reported ~run behavior on Windows with sbt 1.3.x. Compare it with sbt 1.2.8 and with triggered execution for compile, then verify that changing source files recompiles without a browser request.