@LaF0rge I just looked at this.
The plugin does not need to add explicit 3.3.2 support as it already has this in the compatibility file.
< 3.4.0.beta1-dev: 3a6512d0560211b93f022a27ed7276024d0020dc
If you’re using a standard install of Discourse on 3.3.2 then you will be automatically be on commit 3a6512d0560211b93f022a27ed7276024d0020dc of the plugin for which the category dropdown works. See further: