Failure to import URL preview media from Synapse?

[turt2live]

synapse  | 2023-10-10 20:34:40,445 - synapse.access.http.8008 - 465 - INFO - GET-196734 - ::ffff:172.18.0.8 - 8008 - {None} Processed request: 0.014sec/0.001sec (0.001sec, 0.000sec) (0.000sec/0.006sec/1) 96B 404 "GET /_matrix/media/v3/download/shady.website/2023-10-10_ArPCFfBxcjafUyxB HTTP/1.1" "Go-http-client/1.1" [0 dbevts]

panic: received status code 404 [recovered]
	panic: received status code 404

goroutine 28 [running]:
main.main.func1({0xd7d220?, 0xc000274ad0?})
	/opt/cmd/import_synapse/main.go:118 +0x25
github.com/panjf2000/ants/v2.(*goWorker).run.func1.1()
	/go/pkg/mod/github.com/panjf2000/ants/[email protected]/worker.go:54 +0x75
panic({0xd7d220, 0xc000274ad0})
	/usr/local/go/src/runtime/panic.go:884 +0x213
main.doWork.func1()
	/opt/cmd/import_synapse/main.go:173 +0x578
github.com/panjf2000/ants/v2.(*goWorker).run.func1()
	/go/pkg/mod/github.com/panjf2000/ants/[email protected]/worker.go:67 +0x97
created by github.com/panjf2000/ants/v2.(*goWorker).run
	/go/pkg/mod/github.com/panjf2000/ants/[email protected]/worker.go:48 +0x65

[jordemort]

Here's the relevant row, from Synapse's local_media_repository table:

"media_id"	"media_type"	"media_length"	"created_ts"	"upload_name"	"user_id"	"quarantined_by"	"url_cache"	"last_access_ts"	"safe_from_quarantine"
"2023-10-10_ArPCFfBxcjafUyxB"	"text/html; charset=utf-8"	2995	1696937550591		"@jordan:shady.website"		"https://login.doo.dad/if/flow/signup/?itoken=[redacted]"	1696970121574	false