Mangadex chapter updates incomplete #516

Brief summary

Updating the feed for bookmarked manga on Mangadex often overlooks new chapters. This is consistent behaviour in that it happens often, and the overlooked chapters can remain overlooked for months. It is inconsistent in that there does not appear to be a pattern in the manga being skipped.

Could be Mangadex rate limiting queries, could be Android getting aggressive with background tasks (although the spinning arrow notification should prevent that).

PS - This may be a parser problem, if so please close and I'll repost there.

Steps to reproduce

bookmark lots of manga on Mangadex
run chapter update, wait for completion
manually check the bookmarked manga
find several that have new chapters that were not found by the update

Kotatsu version

6.1.3 and at least 6 months prior

Android version

12

Device

Oneplus 6

Acknowledgements

I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
If this is an issue with a parser, I should be opening an issue in the parsers repository.

### Brief summary Updating the feed for bookmarked manga on Mangadex often overlooks new chapters. This is consistent behaviour in that it happens often, and the overlooked chapters can remain overlooked for months. It is inconsistent in that there does not appear to be a pattern in the manga being skipped. Could be Mangadex rate limiting queries, could be Android getting aggressive with background tasks (although the spinning arrow notification should prevent that). PS - This may be a parser problem, if so please close and I'll repost there. ### Steps to reproduce 1. bookmark lots of manga on Mangadex 2. run chapter update, wait for completion 3. manually check the bookmarked manga 4. find several that have new chapters that were not found by the update ### Kotatsu version 6.1.3 and at least 6 months prior ### Android version 12 ### Device Oneplus 6 ### Acknowledgements - [X] I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open issue. - [X] If this is an issue with a parser, I should be opening an issue in the [parsers repository](https://github.com/KotatsuApp/kotatsu-parsers/issues/new/choose).

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