I wouldn't say it's normal, because it's not normal. Transmissions shouldn't grind when shifting, if it does, something is wrong. Don't let it go without trying to fix it, grinding synchros/gears is not good on a tranmission. I used to have second gear grind at times when shifting. Mitsu replaced second gear for me under warranty, still grinded at times. Then I sent it to TRE, no more grinding.
So lets just say it's common, but not normal.
p.s. Get it fixed.
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