Had you entered into 2024 TurboTax a 2025 Form 1099-R with codes J and P instead of a 2024 Form 1099-R with code 8, the result would have been the same. The each taxable amount of about $1,100 (box 2a) would be included on Form 1040 line 4b.
Code 8 only applies to the year of the Form 1099-R. Code 8 cannot cause TurboTax to produce any effect on any other year's tax return.
However, the fact that your 2024 Form 5329 reported an excess Roth IRA contribution, in the IRA contribution entry section it seems that you failed to tell TurboTax that you would remove the excess Roth IRA contribution, so you need to amend to correct that. Doing that in 2024 TurboTax you could also correct the Form 1099-R entries, taking care to indicate that the Forms 1099-R are 2025 forms, but that would not change the amount on Form 1040 line 4b unless you had entered an incorrect amount in box 2a. (If you failed to mark the IRA/SEP/SIMPLE box, the approximately $1,100 times two would have mistakenly appears on line 5b instead of on line 4b, so you would want to correct the form entries so that the taxable amount appears on line 4b. With code J present, the IRA/SEP/SIMPLE box does not need to be marked since the code J indicates that the distribution is from a Roth IRA.)
