I see mould, is that a problem?
Generally not. If the shiitake farm is running a little to damp after the soak, sometimes mould may appear. Often the shiitake can fight back and deal with it. If it’s struggling or looks like it’s getting worse, try dabbing some hydrogen peroxide on the mould. At worst, you may need to carve out the affected part.
If unsure, send us a photo, we can usually diagnose and offer solutions from that.