Queue stuck (fixing cypress-plugin-snapshots)

[FriOne]

Here I have queue started with readFile. It starts when you click on the compare button (it is a visual regression tests plugin).
When you click the first time on the compare button it works, but on the second time, Cypress only adds commands in its queue and doesn't execute them. You can reproduce "the bug" by running commands npm start and npm run cy:run:example.
cypress-plugin-snapshots's origin author left TODO in his repository about this.
Does somebody know why does it stuck?