Variable in example doesn't work. Instead, it creates the folder literally called {{series_name}}
Quotation marks and apostrophes do not make a difference.
Forward or backward slashes do not make a different.
Windows machine. Python 2.7. Flexget 2.13.2

qbittorrent:
path: P:/Pending/{{series_name}}/
host: localhost
port: 8888
Have also tried numerous other configurations with path. For example

series:
settings:
set:
path: P:/Pending/{{series_name}}/

Just simply does not want to use the variable whatsoever.
Works fine in uTorrent plugin, but as I've switched to qBittorrent it is causing a headache unfortunately. Everything else working fine so appears to just not be supported / meant to be used in this manner.

Please kindly add the {{series_name}} ability to work with qBittorrent