A community member was able to replicate the Vision demo with the Anthropic block, but not with the OpenAI block. They attached screenshots of both examples and asked if they were missing something or if it was a bug. Another community member provided a link to the OpenAI Vision support documentation, and a third community member mentioned that they had the same issue in the self-hosted version and asked Baptiste for any ideas. The issue was resolved when the original community member found that appending values in the "Chat history" variable with a line break between them allowed the OpenAI block to work.
It seems like part of the problem I encountered was due to appending values in the "Chat history" variable (I added a line break between the values and it worked). Thank you, @Baptiste !