Sometimes you'll be working on a task and encounter some other part of the codebase that needs fixing, tech debt if you will. Other times, when digging through logs for your current task, you'll discover a strange issue that affects a small percentage of users in a specific region, but only on the weekends. If it takes less than an hour to fix, you should tackle it as part of your current task.

"But I have another more important thing to do!" I hear you say "It's out of scope!". I promise you it's not a big deal, you can do both. Don't make a Jira ticket and put it in the eternal backlog, just fix it. Don't post a Slack message for people to discuss, just DO THE THING that's required and fix it. Since your code will (hopefully) be reviewed anyway, in these cases it's better to ask for forgiveness when/if the time comes. More often than not, you'll actually be praised by your peers for finally tackling that thing nobody wanted to touch, and you'll save everyone from yet another conversation on how nobody has enough bandwidth this sprint to pick it up.