Reprogram your mind : Incident 6

I recently had a very bad experience in my office with my supervisor, assistant tech lead and one of my company director (who was also my previous supervisor). When my supervisor went for a paternity leave, he had assigned my previous supervisor and assistant tech lead to review my work. When he came back, he mentioned that he had assigned a 2 weeks long task for me to create a manual for one of our projects to explain the working of a system to share with our support team.But before he left he never told me two things 1. That I need to keep screenshots of the process along with the steps , 2. The timeline when I have to complete it and share with client. But when he told my previous supervisor and assistant tech lead somehow I missed out my work and need to complete it first , I was shocked. Even though I kept quiet for half the day, it was killing me so I decided to standup for myself . I send a messge in group where he tagged them saying I missed out a task highlighting to my supervisor that he missed out to share the timelines with me also missed out to tell me to add the screenshots. I also kept a message saying it might have been a miscommunication or misinterpretation to soothe things out. He partially agreed saying he missed out to share the timelines to share the document because he was busy. But I felt what he did was an accusation, which shows I had a very bad work commitment so I decided to address the situation to the best way possible instead of taking the blame. We should not take the blame for everything people throws at us, when we clearly know it was a lack of communication and guidance.