Library contents appear missing after update (Jellyfin on Synology NAS)

[kmrg2500]

Update:

I deleted a library (Books) and added it back using the same folder path (/books_mnt) as before. The "Book" contents now show up in the library browser as before. Also, previously viewed audiobook tracks (viewed prior to the issue) were correctly displayed as "watched". However, the custom images were blown away. I tried all combinations of "refresh metadata" (scan for new, search for missing, then replace all) with no success. No old or new images show, just the default image showing a white folder with blue background. The failure to download new images may be a quirk of the Books library, because I recall needing to manually add author and book images before.

While doing the above, I also checked the log and found a couple noteworthy items:

I noticed the path is different on these two INF statements. One is to the mount location pointing to the directories on the NAS (/books_mnt), while the other looks like the default path in the docker container (/config/root/default/Books).
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[2023-12-27 15:34:01.793 +00:00] [INF] [95] Emby.Server.Implementations.Library.LibraryManager: Removing item, Type: "Folder", Name: "books_mnt", Path: "/books_mnt", Id: 6553e6f5-6a83-f3cb-dfff-0eb78a76c96e
[2023-12-27 15:34:20.951 +00:00] [INF] [71] Emby.Server.Implementations.Library.LibraryManager: Removing item, Type: "CollectionFolder", Name: "Books", Path: "/config/root/default/Books", Id: 4e985111-ed7f-570b-5952-04d82adb02f3
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There were about a dozen of these errors all pointing to the same ....acc1340/logo.svg. The logo.svg was associated with another banner image from a different library (Movies). I deleted the svg file and refreshed metadata - no effect. I'm guessing the logo.svg error was unrelated to the problem.
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[2023-12-27 15:35:45.814 +00:00] [ERR] [94] Emby.Server.Implementations.Library.LibraryManager: Cannot get image dimensions for "/jellyfin_config_mnt/metadata/library/26/26df4295bb2a27cdfb18be7c7acc1340/logo.svg"
System.Xml.XmlException: Reference to undeclared entity 'ns_extend'. Line 13, position 16.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.HandleGeneralEntityReference(String name, Boolean isInAttributeValue, Boolean pushFakeEntityIfNullResolver, Int32 entityStartLinePos)
at System.Xml.XmlTextReaderImpl.HandleEntityReference(Boolean isInAttributeValue, EntityExpandType expandType, Int32& charRefEndPos)
at System.Xml.XmlTextReaderImpl.ParseAttributeValueSlow(Int32 curPos, Char quoteChar, NodeData attr)
at System.Xml.XmlTextReaderImpl.ParseAttributes()
at System.Xml.XmlTextReaderImpl.ParseElement()
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at System.Xml.Linq.XDocument.Load(XmlReader reader)
at SkiaSharp.Extended.Svg.SKSvg.Load(XmlReader reader)
at SkiaSharp.Extended.Svg.SKSvg.Load(Stream stream)
at SkiaSharp.Extended.Svg.SKSvg.Load(String filename)
at Jellyfin.Drawing.Skia.SkiaEncoder.GetImageSize(String path)
at Emby.Drawing.ImageProcessor.GetImageDimensions(BaseItem item, ItemImageInfo info)
at Emby.Server.Implementations.Library.LibraryManager.UpdateImagesAsync(BaseItem item, Boolean forceUpdate)
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I'll wait for feedback before trying this on Movies or Shows for fear of blowing away a significant amount of custom metadata and images.