PDF thumbnailer in Dolphin

[wonder]

Hi.
Today, I made a fresh installation.
When my system update, now I have Plasma 5.8.2.

Before this fresh installation, pdf thumbnailers in Dolphin works fine (with installation the package kdegraphics-thumbnailers

Now, in my fresh installation, also, I installed kdegraphics-thumbnailer, in preferences of preview in dolphin, select pdf files, but not work, not preview of this pdf files.

Regards.

[wonder]

Solved.
After a time, my system indicate some updates, include kdegraphics-thumbnailer.
After this update, works fine.

Sorry.