Overflowing labels in CheckboxList don't break correctly with Bootstrap 4

[NicoNuernberger]

Steps to reproduce the issue

1. Setup Yii2 with Bootstrap 4
2. Create a form and within that form create a checkbox list for a model. Ensure that the list of checkboxes is rendered within a container with a limited width and that the list of choices contains at least one string long enough to surpass the width of the container. My example:
   $form->field($formModel, 'answers', [ 'showRequiredIndicator' => false, ])->checkboxList($formModel->possibleAnswerStrings);
3. Check the rendered view

Expected behavior and actual behavior

On 1.60, the checkbox list behaves as expected with Bootstrap 4:

With the following HTML: Pastebin

On 1.6.1 and upwards i get the following however:

With the following HTML: Pastebin

Environment

Browsers

• Google Chrome
• Mozilla Firefox
• Internet Explorer
• Safari

Operating System

• Windows
• Mac OS X
• Linux
• Mobile

Libraries

• jQuery version: v3.6.0
• yii2-widget-activeform version: from 1.6.1 upwards
• Bootstrap 4.6.2

Isolating the problem

• This bug happens on the demos page
• The bug happens consistently across all tested browsers
• This bug happens when using yii2-widget-activeform without other plugins.