Change 661911 had a related patch set uploaded (by Nik Gkountas; owner: Nik Gkountas):
[mediawiki/extensions/ContentTranslation@master] SX Fix TranslatedSegmentCard for empty translation MT option

https://gerrit.wikimedia.org/r/661911

Change 661911 merged by jenkins-bot:
[mediawiki/extensions/ContentTranslation@master] SX Fix TranslatedSegmentCard for empty translation MT option

https://gerrit.wikimedia.org/r/661911

the original issue looks solved but I've spotted another one:

once we edit the translation and then go back to it, the "edited by you" is at 100%.
if we keep going back on the sentences already translated with MT, it keeps showing 100% instead of 0%.
(video with the issue on the previous comment)

Is this to be solved here or a different ticket?
@Pginer-WMF

In T273444#6839669, @Jpita wrote:

the original issue looks solved but I've spotted another one:

once we edit the translation and then go back to it, the "edited by you" is at 100%.
if we keep going back on the sentences already translated with MT, it keeps showing 100% instead of 0%.
(video with the issue on the previous comment)

Is this to be solved here or a different ticket?
@Pginer-WMF

From your comment it is not clear why you think it is wrong to show these sentences are 100% edited by you. My understanding of the scenario is that you used "Start with an empty sentence" so the starting point was an empty string, you wrote some contents completely from scratch and those contents are considered 100% coming from you. For example, in the video "asdasdas" has been modified completely form the initial text provided automatically (""). Does that make sense or am I misinterpreting something about the context here?

In T273444#6840205, @Pginer-WMF wrote:

In T273444#6839669, @Jpita wrote:

the original issue looks solved but I've spotted another one:

once we edit the translation and then go back to it, the "edited by you" is at 100%.
if we keep going back on the sentences already translated with MT, it keeps showing 100% instead of 0%.
(video with the issue on the previous comment)

Is this to be solved here or a different ticket?
@Pginer-WMF

From your comment it is not clear why you think it is wrong to show these sentences are 100% edited by you. My understanding of the scenario is that you used "Start with an empty sentence" so the starting point was an empty string, you wrote some contents completely from scratch and those contents are considered 100% coming from you. For example, in the video "asdasdas" has been modified completely form the initial text provided automatically (""). Does that make sense or am I misinterpreting something about the context here?

Sorry, bad explanation from my part.
in the video, the first two sentences are MT translated, only the third one ("asdasdas") is "Start with an empty sentence".

Thanks for the clarifications @Jpita. I created a separate ticket: T275124: Stats from previous sentences become wrong after starting one as an empty sentence
Feel free to add any missing details.