I don't know what test you mean. But I did a test, following to your comment. I connected respectively followed my vutuv account from Piefed. Then I made a post and a change to my CV on vutuv. The post was shown quickly on Piefed, but the change to CV was not. Then I commented the post on both platforms and reacted with a vote and an emoji reaction on Piefed. The comment from vutuv was shown in piefed. The comment on Piefed was not shown on vutuv. The reactions and the vote did not pass in any direction. I have seen exactly the same behavior between Piefed and Pixelfed, by the way. I do not use Mastodon, so I cannot test from there. Maybe it works better, as the apps explicitly mentioned Mastodon in some places.