You can replicate this by making a clean test vault. Install Pandoc Reference List. If pandoc is on the PATH, it should find it. Supply a .bib file and create a file with a citation. It works as expected. Install and enable Pocket integration. Restart vault. The reference list will say "No citations found in the active document", validation in the settings will fail with the error "pandocMarkdownToHTML not found: pandoc".
You can replicate this by making a clean test vault. Install Pandoc Reference List. If pandoc is on the PATH, it should find it. Supply a .bib file and create a file with a citation. It works as expected. Install and enable Pocket integration. Restart vault. The reference list will say "No citations found in the active document", validation in the settings will fail with the error "pandocMarkdownToHTML not found: pandoc".
See this issue for details. https://github.com/mgmeyers/obsidian-pandoc-reference-list/issues/38#issuecomment-1443768026