As your sync is very likely to include plasma 6 and plymouth there is some adjustments to watch out for.
I don’t know what is specifically needed for your system but the following is likely helpful
- Black Screen with Plymouth - Cause and Solution
- [Stable Update] 2024-05-29 - Kernels, Plasma 6.0.5, GNOME 46.2, Mesa - #2 by Yochanan
Especially check the 2024-05-13 section on the KDE Plasma update