Hello @Asier Vadillo
I’d start by separating the "Time spent" field from your standard custom fields. In Jira Cloud, this is tied directly to the "Time Tracking" functionality, which means it doesn't always appear on the layout like a regular text box. That's pretty much ultimate thing you should remember.
First, check your "Time Tracking provider" under "Jira settings > Issues". If Tempo is selected, it takes over the UI, and the native Jira time tracking display may not behave the way you'd expect. If you're using native Jira, verify that the "Time Tracking" field isn't set to "Hidden" in your "Field Configuration" and that your users have the "Work on issues" permission in the project's permission scheme.
In most cases, you don't edit "Time spent" directly; you log work through the "Log work" button or the dedicated Time Tracking panel in the issue sidebar. If that panel is missing, it’s almost always a provider or permission conflict rather than a simple layout issue. Focus on the provider settings first, as that’s usually where the disconnect happens when using apps like Tempo.
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