if present perfect, followed by would

"If Pluto has just been discovered, there's no doubt that it wouldn't be termed a planet."

Is this sentence grammatical?

I would use had just been discovered. Has sounds wrong to me.

Tdol said:

I would use had just been discovered. Has sounds wrong to me.

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Would that be a major mistake in conversation or one of those that would only be noticed by teachers?

ostap77 said:

Would that be a major mistake in conversation or one of those that would only be noticed by teachers?

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It is something that native speakers just wouldn't say, and they would notice it if a learner said it, in my opinion.