Freshly added tags not found?

[abr01]

I have added some tags to images, but they won't be found in my Tags filter, which works otherwise. Are the newly added tags being scanned after a while, with some delay, or have i to rescan the index every now and then? Normally i would expect them to be indexed almost instantly, since i have included them in ETs properties.

[abr01]

Now i had the whole index rebuilt, but the tags in question are still not found. How can that be? I'm able to find my older tags, and tags are included in the description.

[abr01]

Update, the issue is now partly solved. I had made a test with another JPG, it worked like usual. But the two JPGs in question still were not found. Which was suspicious. So i made a screenshot of both images in the JPG format, tagged them, and sure enough, both images are now found like expected. What leads me to the conclusion, that there must be something odd going on with those original JPGs. And there is something in common with those images, they are from a Xiaomi Redmi 13 smartphone. Therefore i guess, that the format from those JPGs must somehow differ from the usual JPGs.