I read somewhere that biomeMask = 0 and situationMask = 0 are no more allowed ...

[Gordon Dry]

If this is true, all Science Definition configs containing

biomeMask = 0
and/or
situationMask = 0

are then not triggering anymore?

So I just created another weird zFinal patch for my personal use to check the outcome:
GameData\zFinal\zzz_fix_biomeMask_situationMask_0.cfg

@EXPERIMENT_DEFINITION:HAS[#situationMask[0],~biomeMask[],#requireAtmosphere[?alse]|#requireAtmosphere[FALSE]]:FINAL
{
	@situationMask = 48
	@biomeMask = 48
}

@EXPERIMENT_DEFINITION:HAS[#situationMask[0],#biomeMask[0],#requireAtmosphere[?alse]|#requireAtmosphere[FALSE]]:FINAL
{
	@situationMask = 48
	@biomeMask = 48
}

@EXPERIMENT_DEFINITION:HAS[#situationMask[0],~biomeMask[],#requireAtmosphere[?rue]|#requireAtmosphere[TRUE]]:FINAL
{
	@situationMask = 63
	@biomeMask = 63
}

@EXPERIMENT_DEFINITION:HAS[#situationMask[0],#biomeMask[0],#requireAtmosphere[?rue]|#requireAtmosphere[TRUE]]:FINAL
{
	@situationMask = 63
	@biomeMask = 63
}

@EXPERIMENT_DEFINITION:HAS[#situationMask[0],#biomeMask[>0]]:FINAL
{
	@situationMask = #$biomeMask$
}

@EXPERIMENT_DEFINITION:HAS[#biomeMask[0],~situationMask[],#requireAtmosphere[?alse]|#requireAtmosphere[FALSE]]:FINAL
{
	@biomeMask = 48
	@situationMask = 48
}

@EXPERIMENT_DEFINITION:HAS[#biomeMask[0],~situationMask[],#requireAtmosphere[?rue]|#requireAtmosphere[TRUE]]:FINAL
{
	@biomeMask = 63
	@situationMask = 63
}

@EXPERIMENT_DEFINITION:HAS[#biomeMask[0],#situationMask[>0]]:FINAL
{
	@biomeMask = #$situationMask$
}

https://www.dropbox.com/s/eqqr1ffhurf2gt5/zzz_fix_biomeMask_situationMask_0.cfg?dl=1

Edited October 27, 2018 by Gordon Dry
updated patch

[Snark]

Moving to General Mod Development Help and Support.

[Gordon Dry]

Updated patch ^