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

Obsessing about clients outside of work hours.

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

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

The mystery rise of lung cancer in non-smokers - BBC

Off the top of my ancient head:

Serious disappointment when the client cancels a session.

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

Can you share 100 facts about yourself?

General Introduction to Boundaries from Panahi Counseling:

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

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.

'JC, Take the Wheel!' Kevin Smith Looks Back on His Hilariously Heretical 'Dogma' 25 Years Later - Rolling Stone

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

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

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

Relocating to Sweden to save money. I got a job offer of 47000SEK before tax, visas sponsored for my wife & my mother (with a laryngectomy). My wife, a general medicine graduate, wants to specialize in Sweden. Can we live well and save 4000€ monthly?

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