2 Bugs: Picture import and background

Few months ago, everything was fine, but since last months some weird bugs appear:

Bug 1: I tried to insert image by this:

<div align="center"> <img src="https://i.postimg.cc/DzTrRSJB/e115b989af2f795a04c1f183e5b0745.png" width="600"/> <div style="font-size: 14px; color: #666; margin-top: 8px;">text</div> </div>

The image appears in the preview, but disappear in the output image.

Bug 2: The background “transperant“ shows like white background in the output before, but since last month it appear black, making words very unreadable.