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@cygnoir As the replies is first-party functionality, I would say this is a bug in the Bear theme. I'm currently doing some theme-related work for @manton and will take a look at this. So you can just sit back and relax, replies will be included in a future update to the Bear theme.
If you're eager to get replies going, paste the following snippet where you want them to show up (probably right below my plug-in links):
{{ if .Site.Params.include_conversation }}
<script src="https://micro.blog/conversation.js?url={{ .Permalink }}"></script>
{{ end }}