When I took over my first branch, I inherited a counter supervisor our customers absolutely loved. If something went wrong, he found a way to make it right. If a customer needed material, he found a way to get it. If an order became complicated, he stayed with it until it was resolved.

Customers trusted him because he cared.

The problem was that our inventory was often wrong.

A customer would call looking for material. The system would show we had it. The customer would drive to the branch expecting to pick it up, and then we could not find it.

My supervisor had become very good at handling those moments. He apologized, found a substitute product, absorbed the margin hit when necessary, took care of the customer, and moved on to the next order.

But we were spending far more time recovering from the inventory problem than understanding why it kept happening. What started as an occasional workaround had become part of the routine.

Looking back, that is what bothers me most. One of the employees most committed to protecting the customer had unintentionally helped keep the larger issue hidden. He cared so much that he kept solving the immediate problem instead of forcing the larger one into the open.

Committed employees are often the most willing to compensate for an organization’s weaknesses. They create workarounds, absorb extra work, and protect customers from internal breakdowns. As a result, the operation can look healthier than it is.

Customer issues get resolved. Safety numbers look clean. Turnover has not happened yet. The branch still hits the number. From a distance, the organization can look stable because a few dependable people are doing more than anyone realizes.

Most leaders pay close attention to employees who complain, and that makes sense. Complaints get attention because they point to real problems.

But the longer I have led people, the more interested I have become in the employees who do not complain.

Those employees are often among the most committed people in the company. They are also the ones most likely to convince leaders that everything is fine when it is not.

That pattern became even clearer to me when I took over responsibility for a branch that looked strong from the outside.

The branch was profitable, busy, and often ranked near the top of the company. Customers were being served, inventory was accurate, and large accounts were getting attention. On paper, there was little reason to worry.

A big reason for that was the assistant manager.

She was excellent at the work. She was well liked, long tenured, and trusted by many of the branch’s largest customers. She handled a long list of issues that never made it very far because she had already taken care of them.

But her most important contribution had very little to do with reports, inventory, or pricing.

She was holding the culture together.

Her manager was capable in some areas, but his leadership style created real strain inside the branch. His mood could change quickly, and when it did, people felt it. A simple mistake could turn into a public dressing-down. Employees could leave a conversation feeling embarrassed, frustrated, or smaller than they were before it started.

Because she had worked with him for years, she had learned to see it coming.

Sometimes she would step in before he reacted. She would redirect the conversation, calm the moment, or get between the employee and the reaction she knew was probably coming.

That was part of the problem. Her steadying influence was preserving the branch’s results. It was also keeping the full cost of the manager’s leadership from becoming visible.

Eventually, the organization made a change, and he moved into a role where he no longer had direct reports.

That was the right outcome, but it also clarified the problem. The branch’s performance had not been proof that the leadership environment was healthy. It had been proof that one very capable person was absorbing more than anyone outside the branch fully understood.

Amy Edmondson’s work on psychological safety has helped leaders understand why employees need to be able to raise concerns, admit mistakes, and ask questions without fear of punishment or embarrassment. In the field, I have also seen employees stay quiet for another reason: because they are loyal, capable, and used to getting things handled.

Good employees do not always complain when the system makes their job harder. Many of them simply patch the hole and keep moving.

That resourcefulness helps in the moment and becomes dangerous when it turns into the normal way of operating.

Leaders are often taught to look for the obvious warning signs: complaints, turnover, missed targets, customer escalations, failed audits, or employee conflict. Those signs matter, but they often show up late.

By the time those signs appear, the business may already be relying on a few people to fix the same failures over and over before customers or senior leaders ever see them. That should worry a leader.

Instead of stopping at “Why did no one speak up?” ask, “What have people learned to work around?” That question changes how you view the employee who keeps saving the same process: not just whether the customer was saved, but why the customer needed saving again.

Ask your most reliable people three questions directly: What takes more effort than it should? Which problems keep coming back? What would break if you were out for two weeks?

The goal is not to discourage ownership. Organizations need people who take responsibility and protect customers. But leaders should not let the organization depend on the same person fixing the same problem indefinitely. A good number can hide a weak process. Thank the person who made the save, then study why the save was necessary at all.

The best employees can hide the worst problems because they are capable, committed, and trusted. That commitment can give leaders a false sense of how well the operation is working. The customer was saved, but the process remained broken. The branch kept performing, but one person was quietly holding the culture together.

The people closest to the issue may be the very ones keeping it from showing.

The opinions expressed in Fortune.com commentary pieces are solely the views of their authors and do not necessarily reflect the opinions and beliefs of Fortune.