Have you tried thinking of the reasons? I can think of several:
* There's probably a small chance it actually would get fixed, and therefore a decent probability that reporting it would be a waste of their time.
* They needed a solution sooner than reporting it and waiting for fix to maybe eventually appear. Once the workaround was in place there was no need for a fix.
* Sometimes the people running projects you use can be hostile, which makes reporting stuff very unappealing and even stressful. Much better to avoid interacting with them if at all possible.
* They didn't know who to report it to, or how to report it.
* There's probably a small chance it actually would get fixed, and therefore a decent probability that reporting it would be a waste of their time.
* They needed a solution sooner than reporting it and waiting for fix to maybe eventually appear. Once the workaround was in place there was no need for a fix.
* Sometimes the people running projects you use can be hostile, which makes reporting stuff very unappealing and even stressful. Much better to avoid interacting with them if at all possible.
* They didn't know who to report it to, or how to report it.
* They simply didn't have time to report it.