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

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

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

Off the top of my ancient head:

Is it okay for my husband to help other ladies without telling me?

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

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

Obsessing about clients outside of work hours.

Elon Musk posts throwback to SpaceX’s garage days after the 500th Falcon rocket launch; his caption reads - Times of India

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

General Introduction to Boundaries from Panahi Counseling:

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

What are the different celebrity lists (A-list, B-list, C-list, D-list)? How does one become a part of these lists and move up or down in status?

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.

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

Why do some people prefer watching movies than reading novels even if they are both based on the same source material (book)?

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