Drag feature on grid field fails to initialise when using multiple section tabs

[sebszocinski]

Describe the bug
If you have a grid field inside a section tab that isn't the first or default tab, the grid feature doesn't seem to initialise and work.

To Reproduce

1. Create a Fieldset with multiple section tabs
2. Add a Grid fieldtype to one of the section tabs that isn't the main / default one.
3. Create a new entry, add some items to the grid and save
4. Edit entry, click on tab that has the grid field and try to drag and re-order the grid field.

Expected behavior
Grid rows should be draggable

Workaround
I found a workaround by resizing the window down to mobile and back to desktop seems to re-initialise the view and then the drag feature works again.

Environment details (please complete the following information):

• Statamic Version 2.11.14
• Browser: Chrome