SpringBoot Reactive tracing stopped working after migration from 3.1.5 to 3.1.6

After migration 3.1.5 -> 3.1.6 tracing for reactive apps stopped working (no traceId and spanId in mdc).

Link to simple app to reproduce a problem (plain app from initializr with one dummy rest endpoint and customised log pattern): https://github.com/norbson/sb-tracing

Comment From: bclozel

Thanks for the report, I think this is a duplicate of https://github.com/spring-projects/spring-framework/issues/31706.