@ františek dobrota
it's an interesting track i've been told by other pilots too.
the two cases of the MEL probably responds to different failures ?
apu bleed take-off is probably synonymous of high temperature (that justifies the use of APU) and poor thrust with limitation. a situation that doesn't allow any failure in the apu bleed during take-off.
the right explanation of those two cases are still unknown anyway if if we might have good clues