Conflicting W2c and 1099-R

In the 2023 tax year, I made an excess deferral into my employer's retirement plan 457(b). I notified my employer, and they notified the plan administrator. I received a corrected W2 from my employer and a check for the excess deferral. However, the check was for slightly more than the amount on the corrected W2. I filed using the corrected W2, thinking I would received two 1099-R forms in 2025, one for the excess deferral amount, and  a second for what I assumed was gain on that amount. However, the 1099-R (Code P) form I received this year has the full amount on it, which is still slightly more than what was listed on the corrected 2023 W2. I contacted the plan administrator, and they say the form is correct. Do I need to amend my 2023 return to reflect the amount listed on the 1099-R, and how would I do that? I've already entered the corrected W2, so do I just need to enter the remaining difference elsewhere in my 2023 return? Thanks for your help!