No, they don't show other posts no matter what tags they use. That would be a catastrophe if that would be the case since we get hundreds of Utopian-io tags from Steemit posts every day but luckily we don't have to deal with them because they were not submitted via the platform. And vice versa they don't drop out of their platforms either when edited on Steemit either.
I am not a developer so I have no clue what you have to change but I am 100% certain that it is possible since it works there. :)
Ok I changed it and you can now edit your dMania posts on Steemit. You were probably right, it was too restrictive and other users had the same problem.
Your post is now visible on your dMania profile again.