When sending WebP images, the preview isn't loaded immediately

[jonas2515]

When sending a WebP image to another user in Nextcloud Talk (by clicking the attachment button for chat messages), there is no preview in the send dialog, and also no preview in the chat view after clicking the send button (instead there's a placeholder icon for the image).

When reloading the page afterwards, the preview is shown just fine, and for the other person in the chat the preview also appears immediately after receiving the message.

The issue seems to be specific to WebP images and happens with both Firefox and Chrome, with JPEG everything works as expected.

It seems that a jpeg preview is requested from the server and also correctly returned by the server, so the issue seems to be on the client side.

Here's a video how to reproduce the bug:

Screencast.from.2024-07-31.15-50-26.mp4