Cam Group Viewings Showing Old Thumbnails

With the latest app version, notice when viewing groups of cams, some thumbnails are very old. For example, when I veiw the group cams in the evening, some thumbnails are from daytime. We see those thumbnails before live streaming starts. If I click a cam in the group and go back to group viewing, the thumbnail of that cam get updated.

No such issue for standalone cams. Only cam groups have this issue.

No such problem after switching back to older app version

Do anyone notice this issue ?