TL;DR

Another week, another issue from the void. This time I have a video of an issue where Gmail fails to delete all spam messages in my spam inbox.

Gmail has an excellent spam filter. As this algorithm is not 100% correct, Gmail puts all spam messages in your spam inbox and keeps them for 30 days. You can select specific spam with checkbox, and then delete it, or you can click on the blue text that says (in Croatian), immediately delete all spam messages. Video shows that Gmail fails to delete one spam message without any user error notification.