Please specify game version

b201 but could be earlier

Then can you give more details on this issue? I don't quite understand the 8 -> 4 thing.
I've played this track on a loop and it repeats at 4th sample, transition sounds smooth

hmm on older version it used to repeat at 8th but on recent version its on 4th instead

I don't find it unpleaseant for some reason, the only sound that could stop abruptly is smoothed out nicely, at least on a PC version, but since music synthesizer is the same on all platforms, it should sound the same on Android and iOS too. When it loops from sample 4, the looping part is longer and is less repetitive, that's why it has been changed.
Can you maybe record a harsh transition on your device so I can hear it?

oh "unpleasant" might sound a bit harsh there, im used to hearing the loop starting at 8th sample so it kinda sticked out when i played on a new save (especially the ringing sound from sample 4 to 7), just a personal preference sorry about that