I wouldn't expect any real-world differences between releases as nothing on the kernel side has really changed (nobody did any real work on the decoders since 2020). That said, Kodi and ffmpeg versions changed so it's not impossible. Seeking is generally okay on H264 in my testing, but the decoders are all known to be imperfect, and there are some unresolved memory buffer management issues that when provoked with lots of stop/start/seek activity will leave the decoder driver in a bad state, although I've not see any Kodi crash/restarts from them.
The sole real-world decoding change is https://github.com/chewitt/linux/…aa21f07ee54d028