Chapters are inconsistently marked as read

[KraXen72]

Steps to reproduce

1. Read manga as normal, e.g. 5-6 chapters.
2. close the app
3. return to the app after a while, e.g. 1h, and hit the "continue reading button"
4. see that:

• i am put in the middle of a chapter I already read.
• in the manga view, e.g. first three chapters are marked as read, the fourth is unread and says e.g. page 198, next two chapters are also mark as read.

It doesen't happen always, but maybe 40-60% of the time (happened to me 3 times over the course of 4 days maybe)

It's also worth noting that while the manga in question is a webtoon/longstrip, i usually just tap the sides/use volume buttons to skip whole pages, so it might be something with that.

Expected behavior

It should mark chapters as read when they're done

Actual behavior

See "Steps to reproduce"

Crash logs

N/A

TachiyomiSY version

Preview r587

Android version

Android 16

Device

Samsung Galaxy A55

Other details

I searched for similar issues here and couldn't find it.
I'll try reproducing it on Mihon stable and TachiSY stable as well, and update this issue. if it's an issue in mihon as well, i'll close this and open it there.

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• I have written a short but informative title.
• I have gone through the FAQ and troubleshooting guide.
• I have updated the app to version 1.12.0.
• I have filled out all of the requested information in this form, including specific version numbers.
• I understand that TachiyomiSY does not have or fix any extensions, and I will not receive help for any issues related to sources or extensions.

[BrutuZ]

Sounds like a source with bad chapter naming/numbering and the Mark Duplicate as Read setting

[KraXen72]

I just checked, but I don't use the "Mark duplicate chapters as read" setting (it's on the default value of none)

[KraXen72]

i switched to mihon stable and it's not happening. same source (same backup loaded). leaving it open but no rush since i got a workaround. (I realized most important features like bulk migration have since been backported to mihon from SY)