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@swordplay @nyrath -- No... It is a limitation of the graphics file formats as well.
This is why I don't believe it is beneficial to berate Mastodon users about alt-text and how it IS beneficial to do #alt4you and simply add it as a comment. HELP instead of COMPLAIN.
The comment on the post will also give it a notice from the algorithm which is used to populate the local and federated timelines.
In fact, from my experiments, adding an #alt4you comment is BETTER than giving it a boost.