Most .webp covers do not load on batch added nhentai galleries

[noobworth]

Steps to reproduce

1. Install NHentai extension
2. Batch add multiple nhentai galleries
3. Notice the blank covers on .webp galleries in library

Expected behavior

Covers of batch added galleries properly load and display in library.

Actual behavior

Covers are blank / display a corrupt image icon.

Crash logs

No response

TachiyomiSY version

Preview r575

Android version

Android 12

Device

Xiaomi Redmi Note 9

Other details

Switched to Preview r575 from 1.11.0 with a backup after noticing the blank cover art issue and #1321.
Have tried to delete and re-add the same galleries after switching to the Preview version to no avail (the covers were still blank).
By "most" I mean that some of the .webp galleries (at least one after some quick observation) did load their cover art although it took substantially longer for them to load compared to .jpg/.png galleries.
Covers properly load on latest .webp galleries when browsing the extension directly, but when searching for the added galleries from there they still appear without cover art.

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 1.11.0.
• I have updated all installed extensions.
• I will fill out all of the requested information in this form.