Mattermost image preview can’t handle shadows properly?

[Zero (Zero Clover)]

To be precise, it is the shadow of capture the window when taking a screenshot of the macOS. KDE screenshots also seem to encounter this problem.

The original picture should be:

But it looks like this in Mattermost:

Mattermost Version: 5.38.2

[amy.blais]

We have a ticket for this here: https://mattermost.atlassian.net/browse/MM-36295