After you have embedded a Power BI report into your page and switched to render mode, you may encounter the following issue: the report disappears from the page after 3 to 5 seconds. Here is how this looks like:
When you publish your report, Power BI takes about 3 minutes to do their internal processing. During that time you may notice, in your embedded tile, that the visual disappears after a period of 5 seconds or so. Nevertheless, after 3 to 5 minutes the visual becomes stable and displays normally on the page.
We recommend you to wait for at least 3 minutes after making any changes to the visual in Power BI Desktop or Power BI Service, in order to let Power BI finish their internal job. After that, please start embedding your tile.