Mushrooms in purchased garden soil

Hello,

I purchased showscape organic garden soil for a new (no dig) raised bed i established 2 weeks ago. Mushrooms are popping up every morning -is this a sign that the soil is not fully composted? I have noticed that there are a lot of bark pieces in it. Did I get the wrong type of soil? Are my plants going to suffer in the soil with un broken down bits like this?

Thank you in advance!

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