This is an archived bug report. If you are experiencing a similar issue, upgrade to the latest release and if that does not solve the problem, submit a new bug report
The cause of this issue is line 1543 in system/ee/legacy/libraries/Template.php
// Nested Plugins...
if (in_array($this->tag_data[$i]['class'] , $this->plugins) && strpos($this->tag_data[$i]['block'], LD.'exp:') !== FALSE)The first part of the if condition is not satisfied because $this->tag_data[$i]['class'] is a module and not a plugin, so it is not in the $this->plugins array.
One possible fix is to change that line to
if ((in_array($this->tag_data[$i]['class'] , $this->plugins) || (in_array($this->tag_data[$i]['class'] , $this->plugins)) && strpos($this->tag_data[$i]['block'], LD.'exp:') !== FALSE)A workaround is to add a pi.[mod_name].php to the module, so that it is also counted as a plugin.
ExpressionEngine implements Markdown Extra and BBCode. Please see the Markdown Extra docs and the BBCode Wikipedia article for a full reference.
**bold**, __bold__, *italics*, _italics_, ~strike/del~, `code()`
bold, italics, strike/del, code()
Link: [link title](https://example.com)
Image: 
[blockquote]...[/blockquote], [quote]...[/quote], and Markdown style:
> Some quoted text. > > This is all one quote.
[code]...[/code], and you can also specify the language for syntax highlighting, [code=php]...[/code]
GitHub flavored Markdown code fences are also supported:
```
public function decoderRing($str)
{
return str_rot13($str);
}
```