I suspect this may be related to shader cache downloads, which are hidden to the user.
Possibly a duplicate of #5302. Shader cache downloads are relatively small and normally would not account for a significant delay.
Hello @legluondunet, per "Fixed bugs preventing workshop items or newly installed DLC from showing up on the downloads page" in the 2018-04-02 Steam beta client update, please opt into steam's beta if you are not already and retest this issue.
I can not reproduce this bug for several steam beta, I close this issue. Thank you.
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Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist
When I ask steam to quit, a dialog box appears and ask me to wait for the download of game XXX to finish.
But the download is invisible: no percentage in the librairy near the game name, no download animation at all in the steam interface.
Steps for reproducing this issue: