I’m using the LV2 version of lsp-plugins-1.2.35 and it works fine.
If you’re using the Parametric EQ you have to remember to enable each filter you want to use, since they default to Off.
Since you can can change the values of the different knobs even if the filter is Off (kind of a UI bug) you can be fooled into thinking that it’s active even though it isn’t.
Make sure you change it to Bell or something suitable from the drop-down list and then you also get the handle to drag with your mouse in the Spectrum graph window.