Dual Boot Last Drive Mounted

Since I can not run Feedback Hub, I do not know why, I need to write it here hoping that some could help or it is Windows Bug.

Before Fall Update, I had very satisfying Dual Boot situation like this:

Disk 1 - Win 10 x32
Disk 2 - Win 10 x64 (have to have both of them)

When I start computer, there is a blue screen where I can choose what to boot and then:

Scenario 1
Finished work and Shut Down Win x32. After I turn on computer and choose from the menu to boot Disk 1, with Win x32, it would proceed WITHOUT restarting computer.

Scenario 2
The same situation. If I finished work on Win x64, shut down computer, start it again and choose to boot Disk 2 with Win x64, it would proceed WITHOUT RESTART.

Now.
If I finished work on Win x64 on Disk 2, shut down computer, start it again after a while, IT WILL ALWAYS RESTART computer and boot to Disk 2 and Win x64.

Yes, I did turn off Fast Start Up.

The question.
Is it possible to shut down computer on one of disks, start it again, and if I choose the same Win I previously shut down, to be able to proceed to it WITHOUT restart. I think something is changed in shut down procedure and now it has some new sequence which makes my computer to restart whatever I choose. If it can be setup somewhere in settings, I can not find it where or it could be the new situation chosen by Microsoft which is really annoying. Since I want it as it was before Fall Update, can someone from Microsoft accept this bug announcement or to instruct me how to do it myself if possible.

Thank you.

I've just installed a multi-boot PC and this seems to be the way the Windows 10 boot menu works. The text based Windows 7 boot menu was better since the PC booted whichever OS was selected without going through a full restart cycle. This is what MS calls progress!