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

Obsessing about clients outside of work hours.

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

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

What can you do if you are a full-grown adult, but never experienced being a child?

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

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

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

What firsthand information do you have on prisoner-on-prisoner sexual abuse/rape?

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

Serious disappointment when the client cancels a session.

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

Harvard gastroenterologist ranks popular trends: Is eating cold rice, doing intermittent fasting good for gut health? | Health - Hindustan Times - Hindustan Times

General Introduction to Boundaries from Panahi Counseling:

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.

Off the top of my ancient head:

Did you ever receive genuine remarks from a medium regarding your deceased relative with information that the medium could never normally know?

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