@Marvin I am using Prefect 3. When I submit multiple tasks to run in parallel, the output of those tasks is not shown in the flow run user interface.

It seems you're encountering an issue with parallel tasks not showing their output in the Prefect 3 flow run user interface. From the docs I found, there are no direct mentions about this specific problem. However, the documentation suggests using multiple task workers to run tasks in parallel, which ensures tasks are distributed and executed efficiently. You might want to check if you're setting up the workers correctly and if there are any related settings affecting the task outputs. Here are a couple of links that might be helpful to explore further: 1. Setting up multiple task workers. 2. Infrastructure concepts in Prefect 3. Sometimes, figuring out where those pesky outputs are hiding can feel like searching for a needle in a cosmic haystack. Give those links a look, and hopefully, they'll reduce your cosmic needle-hunting expedition! If it persists, checking GitHub might yield workarounds from the community once accessible.