Immigration in Malaysia has changed their rules for Bangladeshis. Now Bangladeshi passport holders have to pass the immigration office.
There will be several questions that will be asked
# Why are you here?
# How long will you stay?
# Return will see confirm flight tickets
# Must have hotel confirmation. If anyone wants to go to the house of a relative or friend, they have to keep their local identity / permit / local phone number and address.
# Fluent English course
# If all goes well there is no problem but the problem now is that it takes a long time.

There is nothing to worry about, most likely this new rule to prevent Rohingya / illegal entry.