This…
<$transclude tiddler=some-tiddler .../>
is wikified. Yet…
<$transclude $tiddler=some-tiddler .../>
is not wikified.

Thoughts? Bug?
Actual code:
<div class="announcement-body">
<$transclude $tiddler=<<announcement-tiddler>> mode=block />
</div>
pmario
2
For me both of your example code 1 and 2 work fine at tiddlywiki.com
What’s the value of <<announcement-tiddler>>? Check if it is blank?
Weird.
That variable contains the title of a tiddler. Add the $ (modern) I get no wikification. Remove it (legacy), the output is wikified.
Ah, got it: mode ==> $mode
Can’t mix legacy/modern 