This is a bit like insisting on feature x when you choose "no feature x".
@veksha : Does the foo_openlyrics plugin host support your MultiDB plugin?It will never have support for closed-source plugins.
I uninstalled LSP and reinstalled it, and the errors seem to be fixed. When the first non-lyrics song is encountered, the lyrics panel now says "Found nothing" for a few seconds instead of "Searching x%", so I'm assuming LSP isn't searching for something.
I've noticed that the latest version of LSP is from 2016. Do you know if LSP is still being worked on and maintained?