Bugs related to find features ?

[MM0501]

Hello all,

I'm beginner on fusion and I need some help.

I'm trying to recognize shapes in a model imported from a step file using 'find features'.

In the process, I experienced the following.

・Depending on the object, it may or may not be editable. (I can't provide this model.)

・Depending on the hole, it's labeled RevolveFeatures. (Model : example_1)

・Some have a spot boring and some do not and are divided. (Model : Sample_1 and Sample_2)

Do you think these phenomena are bugs?
Also, does anyone know the criteria for determining features in the find features?

Thank you