I know I have to post bugs on github, but since I don't have an account there, maybe someone will post the bug there who have an account, or maybe the staff can check it out here:
If you have an image (in my example called image1.png) and you use it for a TiledBackground but you also use it for a Sprite (The Sprite uses the image for frame1 and the Sprite also has other frames with other images).
Now you export the game to html5-web and choose deduplicate, recompress, minify. Now you should have your exported game with the spritesheets. If the image "image1.png" is in a spritesheet with other images, the TiledBackground shows the whole Spritesheet when playing the game...
This always happens if you use the same image for a TiledBackground + Sprite and the image is in a Spritesheet with other images after exporting. You can fix the problem by not deduplicating images when exporting.
Hope you can fix that problem so I can use same images in tiledbackgrounds / sprites and deduplicate at export-settings.
Version: newest Version of Construct 3