BUG #16588: Unable to delete database due to still connection

The following bug has been logged on the website:

Bug reference: 16588
Logged by: Ronald Catersels
Email address: ronald.catersels@daywize.nl
PostgreSQL version: 9.6.19
Operating system: Windows 10 Pro version 1909
Description:

Since the upgrade to version 25 I am unable to delete any database. It will
always tell me there is still a connection and refuse to delete the
database. In the dashboard you only can see one connection (from pgadmin)
and nothing else. Downgrading to version 24 solves the issue. I can then
delete the database again.
Regards,
Ronald