"Unable to create a jar-filesystem" warning logged upon starting the game

The bug

Upon starting Minecraft in version 1.17.1 Pre-release 1, the following warning is logged in my game log.

Unable to create a jar-filesystem for: jar:file:/Users/user/Library/Application%20Support/minecraft/versions/1.17.1-pre1/1.17.1-pre1.jar!/assets/.mcassetsroot: java.nio.file.FileSystemNotFoundException

acy is shown in the second column of the launcher log window.

This wasn't an issue in 1.17.