A Timeline block can break the editing process of other blocks, probably by a loading  Lodash in the Underscore object "_".

The resulting error is

Uncaught TypeError: this.activateMode is not a function
    _createModes media-views.js:2815

This is a call to an underscore function _.each in a wordpress file https://github.com/WordPress/wordpress-develop/blob/f2bd8d048116e40892df4d6429dad99ede2e4c12/src/js/media/views/frame.js#L77 (that ends up compiled in wp-includes/js/media-views.js)

_.each( this.options.mode, function( mode ) {
    this.activateMode( mode );
}, this );

"_" object in the console before and after inserting a Timeline block:

Replicate this bug by importing the campaign attached here and trying to edit the carousel header. Clicking on it will make the block switch to an error mode "This block has encountered an error etc."