Custom fields added successfully but not displayed in the foreground, what could be wrong?

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Posted May 27 at 14:40

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I added custom fields to a page in WordPress (using native functionality, no plugins), and the backend saves them without error, but I can't see the corresponding content in the frontend page.

I have tried the following call in the template file:

Still no output.
The current theme is custom developed and I would like to ask what are the common reasons why this might happen?

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- lit. a thief will have the guts of a rat2
  Field name misspelled: my_custom_field name does not match the backend. Field value is empty: the field exists but has no content. Incorrect call location: get_the_ID() gets not the current page ID. Template file is not used: the file you changed is not the template used for the current page. Cache or output is broken: Theme or plugin may affect the output.
  May 28, 17:07return (to a previous condition)