Perhaps the 84 second burn overflowed the integer (2^6) and was caught by a 2^7s check (127s)
there’s no way engine burn time is graduated in seconds on a spacecraft in 2023, that’s way too coarse
Why do you expect the Russian space program to be using new equipment after the antique show of an invasion in Ukraine?
Every country uses a combination of older and newer equipment in any war. The war propaganda wizards just try to make things like that look unique to Russia.