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

Obsessing about clients outside of work hours.

Serious disappointment when the client cancels a session.

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

China fast tracks rare earth export licences for European companies - Financial Times

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.

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

What makes you think that former U.S. President Donald Trump's legal team has already been laying the groundwork for an appeal in the hush money trial?

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

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

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

Bettor banned for heckling Olympic star Thomas - ESPN

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.

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

General Introduction to Boundaries from Panahi Counseling:

Only 1,280 Survived: The Near-Extinction Event That Nearly Wiped Out Humanity 1 Million Years Ago - The Daily Galaxy

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