Reminder (for those who don't know this) that capitalising the individual words in a multi-word hashtag helps people with sight difficulties who use screen readers.
Mastodon seems to make all hashtags single-case, so you have to type in the full hashtag instead of letting it autocomplete.
While it may seem tiresome, it's actually a courtesy and a boon.
So, for instance, instead of #wildflowerhour , you use #WildFlowerHour