Missing photo thumbnails with 404 for transcode call to generate

Host: Synology DS918+ DSM 6.2.4-25556 Update 7 (INTEL Celeron J3455)
Server Version#: 1.32.5.7328 (manual download / update in Synology DSM)
Player Version#: 4.108.0 (web version hosted by server).

I have patchy coverage of recent photo imports into Plex. Some subfolders are completely devoid of thumbnails and the actual photographs take some time to actually display as well. These are not massive photographs (13MB 6752x4560 - negative scan) When looking at the logs to see if there was anything obvious, I came across this trace for a single image.

I’ve removed some identifiers, but this is repeated for every photo with a missing thumbnail.

Any thoughts on how to resolve this as missing thumbnails really devalue Plex as a photo store.

Jul 25, 2023 19:56:01.033 [139922286611256] DEBUG - Request: [127.0.0.1:52834 (Loopback)] GET /photo/:/transcode?format=jpg&height=512&url=http%3A%2F%2F127%2E0%2E0%2E1%3A32400%2Flibrary%2Fmetadata%2F70357%2Fthumb%2F####ID####&width=512 (3 live) #252e8 Signed-in Token (X.X)
Jul 25, 2023 19:56:01.033 [139922286611256] DEBUG - [Req#252e8] Photo transcoder: Request for url [http://127.0.0.1:32400/library/metadata/00000/thumb/####ID####] (is local: 1 upscaled: 0)
Jul 25, 2023 19:56:01.043 [139922286611256] DEBUG - [Req#252e8/Req#252e9] Calculated media file path for path [media://b/RANDOMSTRING1.bundle/Contents/Thumbnails/thumb1.jpg]: ["/volume1/Plex/Library/Application Support/Plex Media Server/Media/localhost/b/RANDOMSTRING1.bundle/Contents/Thumbnails/thumb1.jpg"]
Jul 25, 2023 19:56:01.044 [139922286611256] DEBUG - [Req#252e8] Calling back into ourselves for photo to transcode, optimizing the process (status: 404)
Jul 25, 2023 19:56:01.044 [139922604317496] DEBUG - Completed: [127.0.0.1:52834] 404 GET /photo/:/transcode?format=jpg&height=512&url=http%3A%2F%2F127%2E0%2E0%2E1%3A32400%2Flibrary%2Fmetadata%2F70357%2Fthumb%2F####ID####&width=512 (3 live) #252e8 11ms 288 bytes (pipelined: 55)

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