Hi, I'm preparing the Violet Fungus encounter on the 3rd level. The stat block says no vision but tremor sense 60 feet. It does not specify if tremor sense is precise or imprecise. I know the default rule for tremor sense is that it is imprecise, but normally when a monster has no vision, the stat block will normally tell you whether their other senses are imprecise or not. (See giant fly Bestiary 2 pg. 120). The Violet Fungus does not seem to have anything else in their stat block to make up for it being at such a disadvantage if it's considered to be blinded (-2 AC from flat footed (off guard) and DC11 flat check to even hit).
Was this an oversight in the editing / production of the book? Is the violet fungus' tremor sense supposed to be precise?
I don't think that it is an oversight. There are actually a lot of plant/fungus creatures (PF2 and real world) that don't have sight. They just move towards food and lash out.
Also, they are Weak versions. They are described as basically a food processing tool that the ghouls are using, so they aren't supposed to be much of a threat to the party.