I have to confirm this too.
Even if the tracks are built to a certain point (just before they would start a tunnel) completely aligned, and end both at a staight wall, tunneling of the first line will lead to a “jump” (usually just 1-2 ticks) that the other line can’t align to.
This is quite sad whan it comes to spend hard earned money on high speed tracks (to earn even more).
I can’t defnetly confirm that this is due to the last upgrade, but at least i had no issues like this befor this upgrad on smaller maps.