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

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

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

Off the top of my ancient head:

There's no way Republican Trump won all seven swing states. How was he able to cheat and steal the election?

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

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

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.

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Obsessing about clients outside of work hours.

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

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

How would you advertise if you wanted to be a "tour guide" who can take you through the dark web while warning you what not to look at and not to click on?

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

General Introduction to Boundaries from Panahi Counseling:

Serious disappointment when the client cancels a session.

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