Grafana not attach image to telegram after update

Hi! After update to grafana 6.1.3 images not attach to alerts in telegram.
Checkbox on “Include image” on.
In Log file:
t=2019-04-10T18:06:24+0300 lvl=info msg=Rendering logger=rendering path=“d-solo/000000045/main-metrics?orgId=1&panelId=5”

In /var/lib/grafana/png/ present rendered images.

But No image in telegram chat.

What’s wrong?

It’s a bug of alerting provisioning. If i create similar config manually all works fine. But if i make it by provisioning images in messages is broken.

Create bug issue -