To anyone playing especially online chess, it is well known that time management is at least as important as the material on the board. But in very many instances, this crucial information systematically or sporadically disappears from the saved games.
If I'm not wrong, the clock info systematically disappears for all games played against bots. It also disappears sometimes in the saved games, even more so if you want to share or download the PGN, and this also happens in the saved analysis. (The analysis (which you can for example add to "saved analysis") being distinct from the recorded game, which you can for example add to your "game library".)
In some instances, during the "game report" and/or in the " analysis" mode, only the final time is displayed on the clocks, whichever move you go to. In some cases it displays the total = initial time, and sometimes it doesn't display any such information.
There is no reason that the clock info ever disappears once it is there. IMO this absolutely *must* be fixed, given that the time control is an integral important and very often decisive part of the game (often more important and decisive than the material on the board !)