What are some signs that a therapist may have poor boundaries with their clients?

General Introduction to Boundaries from Panahi Counseling:

Obsessing about clients outside of work hours.

Disclosing feelings, fantasies, and experiences to the client in ways not related to the work the client is engaged in.

Why are there no fossils for the 'missing link' that connects our ancestors with other species? Is this a misconception or is there another explanation?

Failing to mention the client in supervision/consultation, out of fear the supervisor/consultant will advise return to ordinary healthy boundaries.

Sense of competition with persons who are important in the client’s life.

Frequent phoning or texting of clients to “check up on them and make sure they’re OK.”

Why do some people believe that Homelander would be no match for Superman or Thor?

These items can happen fleetingly, briefly, in any therapy, but if they’re frequent, it’s definitely time for the therapist to get some good, solid supervision/consultation.

Serious disappointment when the client cancels a session.

Routinely going over the time limit with certain patients, compromising the time for the next client.

What are the best ways to treat seasonal allergies?

Eager anticipation (or anxious anticipation) of the next session in ways that distract.

Struggling with fantasies of deeper connections with clients, whether sexual or parental or other intense or intimate relationships beyond psychotherapy.

Off the top of my ancient head:

Who writes and reads novels nowadays?

Session-expressed curiosities about client details not relevant to the therapy.