I can see that the initial document being loaded in the admin panel shows the field I want disabled as actually disabled with full semantics:
<input type="text" id="acf-field_5e4bf7cb12333-field_5e4bf7f212334-row-0-field_5e4bf8e320b2f" name="acf[field_5e4bf7cb12333][field_5e4bf7f212334][row-0][field_5e4bf8e320b2f]" disabled="disabled"/>
However, it appears as though some JavaScript is removing this prop configuration after the document is fully loaded. I haven’t tracked down the offending JavaScript, yet.
If I had to guess, this goes for the others in this thread. This is also on a latest/greatest WordPress instance with minimal plugins loaded. I don’t have anything being enqueued in the admin panel that would be doing this, to my knowledge.
Edit
Ok, got it:
prop (jquery.js?ver=5.3.2:7623)
access (jquery.js?ver=5.3.2:3990)
prop (jquery.js?ver=5.3.2:7590)
d (acf-input.min.js?ver=5.8.7:formatted:659)
(anonymous) (acf-input.min.js?ver=5.8.7:formatted:668)
each (jquery.js?ver=5.3.2:368)
each (jquery.js?ver=5.3.2:157)
i.enable (acf-input.min.js?ver=5.8.7:formatted:666)
enable (acf-input.min.js?ver=5.8.7:formatted:1762)
showEnable (acf-input.min.js?ver=5.8.7:formatted:1774)
show (acf-input.min.js?ver=5.8.7:formatted:4069)
render (acf-input.min.js?ver=5.8.7:formatted:4066)
onNewField (acf-input.min.js?ver=5.8.7:formatted:4012)
u (acf-input.min.js?ver=5.8.7:formatted:987)
i (acf-input.min.js?ver=5.8.7:formatted:920)
i.doAction (acf-input.min.js?ver=5.8.7:formatted:399)
acf.newField (acf-input.min.js?ver=5.8.7:formatted:1815)
acf.getField (acf-input.min.js?ver=5.8.7:formatted:1886)
(anonymous) (acf-input.min.js?ver=5.8.7:formatted:1894)
each (jquery.js?ver=5.3.2:368)
each (jquery.js?ver=5.3.2:157)
acf.getFields (acf-input.min.js?ver=5.8.7:formatted:1893)
r (acf-input.min.js?ver=5.8.7:formatted:1917)
u (acf-input.min.js?ver=5.8.7:formatted:987)
i (acf-input.min.js?ver=5.8.7:formatted:920)
i.doAction (acf-input.min.js?ver=5.8.7:formatted:399)
(anonymous) (post.php?post=245&action=edit:3365)
This is the call-stack I was able to grab after setting a break-point on the element being modify, regarding its disabled property.
This is indeed happening after the document is loaded.
