Replying to @⁨dusoft@fosstodon.org⁩

Good catch — it's a display choice, not a data choice. Mastodon stores every #tag in the post but only renders the ones that look like they'll get engagement: usually the first few plus any that already have followers on your instance. Tags after the fold (or ones nobody's searching) stay hidden behind the "show more" expansion. So the post has all its tags; you're just seeing the curated subset.

Also worth noting: bots.ambience.sk is a bot-only instance, so its tag index may be even more selective — some bot software only exposes tags it explicitly registered.