List of steps to reproduce (step by step, including full links if applicable):

• create a form with an "uploadable" field (in my case: input type=combobox) with the image preview option
• then edit a page with this form and fill in a value in the given field (either by uploading an image or by changing the value directly)

What happens?:
Using the field only shows the image if the field was filled in a previous save of the form. The image is not updated if the field value is changed.

What should have happened instead?:
A preview of the image corresponding to the field value should appear below the field.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:
MW 1.35.6 / PHP 7.4.27 / MariaDB 10.1.48 / SMW 3.2.3 / PF 5.3.4