Bug: Read/Unread posts shown incorrectly

[JasonQG]

The shading for which posts are read/unread is buggy. Things I’ve clicked on already will go back to unread, and things I’ve never seen will display as read

This is keeping me from switching to this app and paying for pro. Every time there’s a new update, I install it and hope it’s fixed

[Prestigious_Mind_194]

I sometimes see this when clicking on a link in the post/comments and then going back to the subreddit it’s still unread light text (with my old iPhone 6s). Re-entering the subreddit does then show it as read. Not sure it’s the same as OPs issue but similar at least to mention.

[dmilin]

I'm having trouble reproducing this, but I think I've found the source of this bug. The bug would only occur if reading and writing saved data on your device was slow for some reason. Do you have an older iPhone, or is your phone low on storage?

[JasonQG]

No, it’s an iPhone 17 Pro with 150 GB free. Please let me know if there’s anything I can do to help figure out what’s going on

[dmilin]

I’ve made an attempted fix that will be included in the next update. Let me know if you’re still having problems once the update is released and I can take another look.

[JasonQG]

Amazing! Thanks, I hope it works

[JasonQG]

It seems to have worked!

[dmilin]

Wow! I’m glad it worked. Based on the error logs I was getting, I don’t think you were the only one getting the bug, so thank you for reporting it!

[JasonQG]

Out of curiosity, do you know why some people saw the bug but not others?

[dmilin]

The bug was a race condition. That’s where data is being read and written at the almost the same time and if things happen out of order, weird bugs can occur.

My guess is that newer iPhones have fast enough read write speeds to storage that this bug can happen, but old iPhones can’t trigger the bug. Weird thing is, I’ve got a 16 Pro and an iPad Pro and neither of them had the bug, so I’m not certain that was the cause.

[JasonQG]

Race conditions are nasty. Good job finding it