Jira

i got a notif on hira that a story I worked on in the previous quarter got unassigned to me by my colleague. We both worked on these tickets and by then it was my second week in the company. this colleague has been trying to pin wrong doings on me and discredit my work. when i showed him the screenshot, he claimed it was claude. should i take this to my manager? This happened a day after our manager reminded us to fill out our brag sheets