Weird Bug
A long time ago (at least five years back), I was working on a legacy project where a few customers reported a strange issue: some input labels on certain pages of our web application would occasionally appear blank.
At that time, we were storing input labels in sessions. For the affected customers, some of these sessions were simply missing, which caused the blank labels (as fallback logic). We tried every possible scenario to reproduce the issue and whatnot, but nothing worked. The issue stayed open for three months, and customers would occasionally ping us for an update. The tricky part was that the issue wasn’t consistent even for customers: most of the time everything worked fine, but sometimes it didn’t, and then they asked for an update on this issue.
I spent at least a few days on this issue, and while searching here and there and everywhere, I came across a report in the Google Chrome (or Chromium) bug tracker. Someone had complained that a missing favicon could cause sessions to crash. At that time, we were not using a favicon in our web application due to white-label support. We couldn’t add one as our company logo because it would conflict with white-labeling support. But then, we used a blank white square favicon. After that, we never heard back this complaint from customers, and after two weeks we closed this issue.
P.S.: Because of recent changes in how search engines display (AI) results, I haven’t been able to find that original bug report.