Raspberry Pi3 Mod.B and 2.4 WiFi on hAP with Band 2GHz-Only-N don't work together"

When I choose any other band except for B/G/N the connection fall.

Similar issues was fixed some time ago:

6.43rc3
*) wireless - improved compatibility with BCM chipset devices

Are you running latest RouterOS versions?

Would it not be better to recommend 6.43.7 stable that would have all the RC stuff inn it?

Does this looks like suggesting older versions?

Are you running latest RouterOS versions?
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After upgrading to v.6.43.7 the problem with ONLY N didn’t disappear. In mode G/N connecting is good.