There's one more concept (I suppose there are many more). People who have always only played from sheet music can be very good at following the directions on the sheet music. On the other hand, if you have always played by 'this is how I have heard it' or 'this is how I like it', there is a potential mismatch. In fact, those who have always used sheet music as their guide might struggle at the prospect of just sitting down and playing a song, which to you is very comfortable.
How that concept fits in your situation is: that they might expect you to read the sheet music and be able to follow it as they can, sort of a rote, not instinctive, thing. But since it's likely your normal mode is different from that, this could cause a problem. For example if they are in a practice and they say start from 'B', you might not know what that means and where to go after 'B', where to them it is like the ABC's.
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