When I first hit a page like http://192.168.33.10/tag:grav I get pagination that makes sense. In this case, two pages. But when I click on a pagination arrow or page number, I end up at a page like http://192.168.33.10/page:2 which loses the important tag: part.
What is the right way to do pagination on a category: or tag: page?
Is your pagination plugin up to date? That was a problem a long time ago, but has been fixed for a while. Also ensure your pagination twig looks correct too:
<p class="prev-next">
{% if not page.isFirst %}
<a class="button" href="{{ page.nextSibling.url }}"><i class="fa fa-chevron-left"></i> Next Post</a>
{% endif %}
{% if not page.isLast %}
<a class="button" href="{{ page.prevSibling.url }}">Previous Post <i class="fa fa-chevron-right"></i></a>
{% endif %}
</p>