Watched Status, Play Count, Date Last Played

I recently finished watching every TV show I have on Kodi. This meant that the Watched Status for all shows, seasons and episodes were all ticked, and all episodes had a Play Count of 1 and a Date Last Played.

Today, I marked all TV Shows as Unwatched.

Unfortunately, this deleted all Play Counts and Date Last Played data. Now the Sort By Date Last Played has no data to sort on.

If I did not mark all shows as Unwatched then when I re-watched a program, it will become difficult remembering what episode I am upto as all episodes are marked Watched from the previous viewing.

Was clearing the extra data the intention when removing the Watched Status? Did I make a mistake in what I did? Or is this a bug?

Thanks.