When I put a Jodit editor (3.4.2) inside a Bootstrap modal (4.3) any of the Jodit toolbar items that popup a form don't allow you to type in the inputs on that form. For example, if you click on the image toolbar icon, a form pops up for you to type in a URL. That input field won't take the focus to allow you to type anything. The buttons on those popup forms do work.
Everything else Jodit-wise seems to work fine in a modal, just not the forms that popup when a toolbar icon is selected. The same Jodit configuration works on that page when it's not in a Bootstrap modal.
Jodit sets the z-index much higher than the modal. There's nothing obvious like the input fields are disabled. I thought perhaps the editor needed to be created after the modal was shown, but that had no effect on the problem.
HTML
<div>
<div>
Click on the image tool. Can edit url input field.
</div>
<div id="editor1"></div>
<button onclick="$('#dialog').modal( 'show' );">
Show modal with editor
</button>
</div>
<div id="dialog" class="modal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div>
Click on the image tool. Can't edit url input field.
</div>
<div id="editor2"></div>
</div>
</div>
</div>
</div>
JavaScript
var editor1 = new Jodit( '#editor1' );
var editor2 = new Jodit( '#editor2' );
Example: https://jsfiddle.net/Lmqj2ybv/1/