Windows Background set via GPO doesn't update

[MS_EF]

Hello all, We enabled the GPO "Force a specific default lock screen and logon image" some time ago, which worked fine. Every computer now has the same background, which it has taken from a network resource. Now we want to exchange this background. We have already changed the file in the network resource a few days ago, but the computers still show the old background. What do I have to do to change the background?

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