What common mistake do developers make with Put and patch, why does the mistake cause problems, and what is the safer approach?

What common mistake do developers make with Put and patch, why does the mistake cause problems, and what is the safer approach? One recurring problem with PUT and PATCH is applying it without understanding the boundary it protects. Using a state-changing HTTP action as a GET route merely because it is convenient for linking. In addition, PUT commonly represents a full resource replacement while PATCH is commonly used for a partial update. Safer engineering approach: keep the responsibility in the correct layer, use the framework's supported API, validate and authorize inputs, avoid hidden side effects, and verify the behavior with tests.