Got a weird bug today...

A new feature I just implemented works but outputs nothing.
So I start printing its inputs early in the code, fine no problem here. Then I print out the supposed results a little bit later, fine too. But now the full program work perfectly.
I find out that if I remove one of those two prints then suddenly my function start outputing empty arrays! WTF?

I think I find a quantum bug, you can observe the bug or the internal values but not both!

I wonder if there is any technical issues that prohibit the creation of open source websites.
By "web sites" I do not consider CMS like Drupal or word press, but rather entire end web site sources.

In fact anything (frontend, backend) except database content that contain user data and credentials.

Not for reusability purposes like CMSs, but simply for transparency and community development purposes, like almost any open source end application.

I agree that a web server is much more exposed than a classic desktop app, as it has lots of targetable private data and internet public access. But for some non-critical purpose this seems to be affordable in exchange of better code review, allowing a community to help improve a tool it uses, and better (not perfect though) transparency (which is an increasingly relevant question nowadays, mainly towards personal data usage).

Because of unusually high temperatures the city is panicking, prohibiting elders and children from going out. The media only talk about it, nothing else matters anymore.

And I'm freezing with a pullover at work right under the air conditioning unit...