When ezgmaplocation is placed within configured field group, it is partially greyed out and thus not readable.

Steps to reproduce:
1. Create a field group "geo" as follows:

ezplatform:
    repositories:
        default:
            fields_groups:
                list: [content, geo]
                default: content

2. Edit "Article" CT.
3. Add ezgmaplocation FieldType and mark it to be located in "geo" group.
4. Create a new "Article".
5. Select "geo" group.

Result:
Part of the map is greyed out, regardless of the scrolling level and position. The same effect applies to the result of searching for a specific location.

Expected result:
The map should be fully visible as in case when ezgmaplocation is placed the standard way (without field groups being in place).

Note:
Even slight browser resizing or opening dev tools brings the original functionality, the map is properly displayed.