fix(plugin): prevent duplicate plugin function initialization (#6787)

Co-authored-by: Shpetim <shpetim.alimi@ndbit.net>
Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>
Co-authored-by: rekram1-node <rekram1-node@users.noreply.github.com>