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