blocks not showing up on picture pages

[NbodySpecial]

I installed PHP_Stuffs to try and add adsense blocks.
Piwigo 14.1
PHP 13.1.18

It installed fine. I created some test blocks (personal blocks).
They show up on the main page fine.
They show up on the categories root pages fine.
They show up on the categories pages fine.
They do not show up on the pictures pages.

I have tested it with multiple blocks- any block will turn on/off for a page, except none will display on the pictures pages.

Content of block: (The main and pictures values indicate what pages the block should show up on . As I did testing and turned pages on/off, that got changed).

<p> This is a test.  Main Pictures
</p>

---

Themes tried: Modus, Clear, Elegant, Sylvia.

I have seen a couple of warnings when adding blocks, no errors. The warnings only appear when adding.

<br /><b>Warning</b>:  Undefined array key 
/home/....../htdocs/piwigo/piwigo/_data/templates_c/p6jhns^394d2d51da70ca22164d446a47bc974cd763019b_0.file.add_module.tpl.php on line 70

Interestingly, if I add a random quote block the results are pretty much the same (show on all but pictures pages) , but there's a longer list of warnings - it looks like one per language in the translations, but effectively the same warning. Just taking the Afrikans one:

<br />
<b>Warning</b>:  Undefined array key "af_ZA" in <b>/home/......./htdocs/piwigo/piwigo/_data/templates_c/p6jhns^0f4c2ce920299fcdf46b1f9b8aa5677c8ea111e5_0.file.config.tpl.php</b> on line <b>45</b><br />

Is there something I'm missing?

[klaoun]

Hello
Try change language from piwigo because af-za is not translating now.

Thx

[NbodySpecial]

I've got the language set to EN_US. It was EN_UK. That warning is repeated for every language- I just took the Afrikans one because it was first.

[NbodySpecial]

I got back and tested this some more. The personal blocks will show up on the picture page, if (and only if), they're above the main block.

Is this expected behavior?