Binary response when using option for Manual PHP create block

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Forum Version: 4.7.16

PHP Version: 8.1.27

Problem Statement: Attempting to use pages->blocks->create new block where Block Type is custom Manual PHP results in binary response on Save.

When attempting to save a custom block of this type, it results in what appears to be a binary response.  It does not matter what is placed in the Content box, the binary response result is always the same.

Screenshot example of usage:

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