Unexpected blank line when using multiple lines in an alert box

[kneep]

Issue description

single line:

{{< alert >}}
abc
{{< /alert >}}

multiple line:

{{< alert >}}
abc

def
{{< /alert >}}

The first and last blank lines of the second box are unexpected. Not sure about the middle one.

Theme version

v2.8.2

Hugo version

hugo v0.125.7+extended darwin/arm64 BuildDate=2024-05-08T14:46:24Z VendorInfo=brew

Which browser rendering engines are you seeing the problem on?

Chromium (Google Chrome, Microsoft Edge, Brave, Vivaldi, Opera, etc.), WebKit (Safari)

URL to sample repository or website

No response

Hugo output or build error messages

No response