Query string image resize not working on umbraco 12

Questions
1

Hi! On Umbraco 12 I’m running into an issue resizing images with query strings. In previous versions of Umbraco I could resize an image in a razor template like so:

<img src="/media/e2sjgvly/200410983-001.jpg?width=400" />

Which would then produce a version of the image with a width of 400px. However, in Umbraco 12 this query string only seems to work sporadically, and more often than not returns an image unchanged. See an example below:

screenshot of a browser window containing an image with the query string width 400 applied. The image remains full size.
screenshot of a browser window containing an image with the query string width 400 applied. The image remains full size.1920×1030 183 KB

We tried upgrading to the latest version of 12 - 12.5.6. Still the same issue.

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/113411-query-string-image-resize-not-working-on-umbraco-12