Authoring tool does not preserve accessibility info
Authoring tools MUST, when converting content from one format to another or saving content in multiple formats, preserve the information required for accessibility to the extent that the information is supported by the destination format.
When content is created with accessible content or features (such as alternative text, heading markup, table structure, etc.) in one format, those accessible features must be preserved when converting the document to another format whenever those features are supported by the destination format.
To fix this issue, ensure that all accessibility related information is retained when content is converted from one format to another. For example:
a. Preserve text alternatives on images. b. Preserve heading level data. c. Preserve table structure and header data.
Note: Some formats may not support all the accessibility information contained in the original format. This requirement is to ensure that accessibility is preserved "to the extent that the information can be contained in or supported by the destination format."