I am unsure about what the expected behavior is. I thought the way the summary bot posted the link isn’t expected to work.
https://meta.discourse.org/t/configuring-the-default-sidebar-for-your-users/347764?silent=true#p-1690272-handling-plugin-added-links-5
Above is the link it posted. I think it would have been silent if it was
https://meta.discourse.org/t/configuring-the-default-sidebar-for-your-users/347764#p-1690272-handling-plugin-added-links-5?silent=true
instead.
I think there are two possible solutions: the bot learns to use the correct format, or Discourse mutes the format that the bot uses.
Edit: I found the other topic about silent and anchor. When I combine this with my observations, it seems that either silent or anchor works, but never both. Silent link seems can't handle #anchor links