Fix issue with apparent codeblock within other codeblock

bot/exts/info/codeblock/_instructions.py

@@ -148,7 +148,23 @@ def get_instructions(content: str) -> str | None:
         instructions = _get_no_ticks_message(content)
     else:
         log.trace("Searching results for a code block with invalid ticks.")
-        block = next((block for block in blocks if block.tick != _parsing.BACKTICK), None)
+        bad_ticks = [block for block in blocks if block.tick != _parsing.BACKTICK]
+        block = None
+        if bad_ticks:
+            block = next(
+                (
+                    bad_tick
+                    for bad_tick in bad_ticks
+                    if any(
+                        block
+                        for block in blocks
+                        if block != bad_tick
+                        and bad_tick.content != block.content
+                        and bad_tick.content not in block.content
+                    )
+                ),
+                None,
+            )
 
         if block:
             log.trace("A code block exists but has invalid ticks.")