Backport PR #5440 on branch yt-4.4.x: [BUG] Make Gizmo's creation_time field robust agai… - #5557

Backport PR #5440 on branch yt-4.4.x: [BUG] Make Gizmo's creation_time field robust agai…#5557

chrishavlin merged 1 commit into

yt-project:yt-4.4.xyt-project/yt:yt-4.4.xfrom

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