SpringBoot Spring Boot Webflux has blocking calls retrieving static content

Bug Report Using Spring Boot 2.4.3 with Webflux, there are blocking calls when getting static resources. Run on Windows 10 with JDK 11.

A simple program with a static image is added in attachment. It contains a static image and when this image is requested, the call is marked as blocking by BlockHound. The problem is that the MediaTypeFactor reads a file from a jar file while handling the request. See test class.

spring-reactor-webflux-blockhound mediatype.zip

Comment From: wilkinsona

Duplicates https://github.com/spring-projects/spring-framework/issues/26631.