<!--more--> eats a couple of paragraphs, adds a <p> tag with asciidoc

I encounter some weird behaviour with how separator is being processed.

I am using asciidoc and have the following in the beginning of my post:

some lead text.

== some subtitle

image::/some_image[some_image]

1. some list
2. etc

When I do not insert <!--more--> tag, everything renders as it should. However, if I insert <!--more--> right after some lead text, the page on the single page view renders as:

some lead text.

1. some list
2. etc

Also, in my list page I have <article>{{- .Summary -}}{{- if .Truncated -}}<a class="read-more" href="{{.Permalink}}">. However, an additional <p> tag renders before the <a> tag, and I could not find any way to remove it.

Please help me to find a workaround. Thanks in advance!

What verson of Hugo do you use?

In the past I had similar problems.
Adding a blank line in front of <!--more--> and after it was my solution.

Thank you! Seems to work.