Custom buttons not visible in TinyMCE about acf HOT 5 OPEN

thanks @elliotcondon, you save my day ! works fine ( we were stuck on Version 5.8.9, on one of our sites! ).

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Hi @Traxo7

Thanks for the code. I've just done some testing and can confirm the issue is due to "timing" changes in the way that JS data is localized on the page.

The simplest fix is to change your action from:
add_action('admin_head', [$this, 'init']);

to:
add_action('init', [$this, 'init']);

Please let me know if this is a possibility, or if there are other concerns.

from acf.

Hi @Traxo7

Thanks for the bug report. Can you please attach some example code to replicate the button issue?

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@elliotcondon

here are pastebins (note that some sensitive data is stripped):

php:
https://pastebin.com/TVrsxw4m
js:
https://pastebin.com/cEqEV0Dm

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Apologies for replying so late, but I haven't tested it yet.
I will post results when I'm able to test it, and delete this notice.

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