I’m not sure if it’s a bug, Whether I have seen it or not, all the pictures are marked as seen, So confused...
system : arch linux
-- update --
This problem only occurs in vivaldi browser, it is normal under firefox and chromium，
-- update again --
In order to confirm whether the problem is caused by browser extensions, I tried to disable/enable several extensions, The problem suddenly disappeared, It seems there is no way to find the reason