channel aliases don't stick

I set aliases for channels in the pidgin via right-clicking on the channel in the main/buddy list window, but they revert when joining channels.

Name         : purple-mattermost
Version      : 1.2
Release      : 8.20190826gite21f18c.fc33
Architecture : x86_64

Name        : pidgin
Version     : 2.14.1
Release     : 2.fc33
Architecture: x86_64

