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

Obsessing about clients outside of work hours.

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

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

Oracle Stock Jumps On Earnings Beat, Upbeat Cloud Growth Forecast - Investor's Business Daily

Serious disappointment when the client cancels a session.

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.

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

Win a signed pink cycling jersey of Giro winner Simon Yates - Team Visma

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

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

General Introduction to Boundaries from Panahi Counseling:

Why are there so many single moms in America?

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

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

Off the top of my ancient head:

Red Bull concedes F1 title fight over after Verstappen Austrian GP crash - Autosport

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