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.

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

Serious disappointment when the client cancels a session.

The Highest Prices You Can Get For Pokémon TCG's Destined Rivals - Kotaku

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

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.

Did you become a cuckold for your wife?

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

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

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

What are some interview experiences with JP Morgan India?

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.

Obsessing about clients outside of work hours.

General Introduction to Boundaries from Panahi Counseling:

US Steel Sale to Nippon Steel Poised To Close After Trump Deal - Bloomberg.com

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