3.0. After adding repeater control to column settings: js errors

Hi guys,

one more bug in 3.0 discovered. After adding repeater control to column settings in Elementor 3.0 we get js errors when trying to remove/delete widgets from the column (the same happens with section as well).

How to reproduce:
we have made a fresh new install with a simple plugin containing following code:

use Elementor\Controls_Manager;
add_action( ‘elementor/element/column/section_style/before_section_end’, ‘my_test_repeater’, 10, 2 );
function my_test_repeater( $element, $args ) {
$element->add_control(
‘my_test_title’,
[
‘label’ => ‘Test Title’,
‘type’ => Controls_Manager::HEADING,
]
);

$element->add_control(
‘my_width’,
[
‘label’ => ‘Width’,
‘type’ => Controls_Manager::NUMBER,
]
);

$repeater = new \Elementor\Repeater();

$repeater->add_control(
‘width’,
[
‘label’ => ‘Width’,
‘type’ => Controls_Manager::NUMBER,
]
);

$element->add_control(
‘my_test_repeater’,
[
‘type’ => Controls_Manager::REPEATER,
‘fields’ => $repeater->get_controls(),
‘title_field’ => ‘Test Repeater’
]
);
}

This plugin adds repeater control to column settings.

After adding a new section/column with some widgets to the page and by trying to remove / delete this widgets we get following js errors in console:

https://prntscr.com/u66ypd

common.min.js?ver=3.0.1:2 TypeError: Cannot set property children of #<Container> which has only a getter

And widgets cannot be removed – nothing happens, widgets remain in column.
Please be so kind to fix this asap. Thank you