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VNAV misinterpreted below altitude restriction for at altitude restriction

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I just had a pretty annoying experience. I was approaching Nantes, France runway 21 doing an RNAV approach. There was an at or below altitude restriction of FL100 at the IAF if I remember correctly. The snowflake directed me so that I passed that waypoint at exactly FL100. Right after passing it the snowflake went below and I had to do 2500 feet per minute to recapture it which caused me to be at about 220 knots at the FAF at 3000 feet. The aircraft must have mistaken the restriction for an at altitude restriction which explains everything. While this has not happened to me before it was a pretty serious bug that needs investigating in my opinion. I hope this is dealt with if it hasn't already,



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