UserKnownHostsFile parameter problems specifying paths with W

Only this weird construct works:
ssh -v -o'UserKnownHostsFile="""C:\Program Files\whitespace test\known_hosts"""' -i 'C:\Program Files\whitespace test\id_ecdsa' user@ip

Nothing else worked for me so far when specifying a path with whitespaces via PowerShell.
The -i parameter on the other side is capable of processing paths with a whitespace.

More badly, when executing the above command that works in PowerShell within a PowerShell module, we get:
command-line: line 0: Bad configuration option: 'userknownhostsfile

So executing an SSH command that contains a user known hosts path with whitespace within a PS module does not work at all.

Observed on:
Windows PowerShell 5.1 (Build 19041, Revision 906)
Windows 10 Enterprise
OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5 (FileVersion: 7.7.2.1)

Reproduce the reported commands in Windows PowerShell 5.1, comparing UserKnownHostsFile and -i when paths contain spaces. Check the command-line parsing for the -o option and PowerShell module execution; done means a whitespace-containing known-hosts path works in both contexts without a bad configuration option error.