Discrepancy between OpenMSX and real hardware (color palette change)

These are the register writes after pressing SPACE in the title screen, according to openMSX logging I added:
Wrote 162 to reg 1
Wrote 159 to reg 3
Wrote 0 to reg 4
Wrote 1 to reg 0
Wrote 2 to reg 0
Wrote 3 to reg 0
Wrote 4 to reg 0
Wrote 5 to reg 0
Wrote 6 to reg 0
Wrote 7 to reg 0
Wrote 8 to reg 0
Wrote 9 to reg 0
Wrote 10 to reg 0
Wrote 11 to reg 0
Wrote 12 to reg 0
Wrote 13 to reg 0
Wrote 14 to reg 0
Wrote 15 to reg 0
Wrote 1 to reg 7
Wrote 226 to reg 1

So, 15 is written to reg 0, which means that the EXT_VIDEO bit is indeed 1. As hap put it:

See https://www.msx.org/forum/msx-talk/hardware/alternative-svi-...

My best guess is that this is what causes the weird palette. On which other machines was this tested?
Anyway, this EV bit isn't emulated by openMSX, because the result isn't very well defined and depends on many factors.

Aha, so that explains the consistency. Can someone try it on another MSX model? That may give different results, if it's the EV bit playing here.