It seems that some manga cause 500 errors when MangaDex is active as a source.
From what I can tell there's a panic when the language "null" is returned:
Caused by: kotlinx.serialization.json.internal.JsonDecodingException: Unexpected JSON token at offset 18787: Expected string literal but 'null' literal was found at path: $.data[2].attributes.availableTranslatedLanguages[21]
Use 'coerceInputValues = true' in 'Json {}' builder to coerce nulls if property has a default value.
JSON input: ....."uk","ms","hi","tl","hu","nl",null],"latestUploadedChapter":.....
It seems that some manga cause 500 errors when MangaDex is active as a source. From what I can tell there's a panic when the language "null" is returned: