Trated of extension dependencies in BC

Hi at all,

I have the next scenerio:

Extension 1 with version 1.0.0.0 Name "Extension 1"
add a field in table customer



Extension 2 with version 1.0.0.0 Name "Extension 2"
add a field in page customer list


Now, I need to modify the extension 1 adding one field more, but when I try to install newly from visual studio code, I get this error:

The Extension cannot be unpublished because it is required by the following apps: "Extension 1"

Somebody knows how can solving this problem?, of course, the example is very simple, but in my case, the hope of extension 1 is bigger than the example and include chages in tables, pages, codeunits...

Is it necesary unistall and unpublish the second extension in all scenarios?, what happend if the second extension is of third person and I haven't this extension?

Best regards.