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

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

Off the top of my ancient head:

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

Mosquitoes are here early. How to keep the world’s deadliest animal out of your backyard. - NJ.com

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

Serious disappointment when the client cancels a session.

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

Trump’s budget puts Huntsville-made spacecraft on the chopping block - AL.com

Obsessing about clients outside of work hours.

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

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.

Telescope Captures First-Ever Ultra-Fine Magnetic Stripes on the Sun’s Surface! - The Daily Galaxy

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

General Introduction to Boundaries from Panahi Counseling:

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

Common herbal supplement used to beat stress linked to liver toxicity - Times of India

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