Databases cannot be deleted while Postgres is being monitored

User impact: User can't remove database
STR:

1. Install PMM 2.16.0
2. Add Postgres to monitoring (with pg_stat_statements or pg_stat_monitor) # Connect to Postgres
3. Try to execute creating and deleting some database
   Actual result:

    postgres=# create database john; CREATE DATABASE postgres=# drop database john; ERROR: database "john" is being accessed by other users DETAIL: There is 1 other session using the database.

   Expected result:

    postgres=# create database bob; CREATE DATABASE postgres=# drop database bob; DROP DATABASE postgres=# 

   I

checked the same case in 2.15.1 and it worked ok.
I also checked the case for enabled pg_stat_statements and pg_stat_monitor but with the same result. When I removed monitoring of Postgres I was able to delete created database.