Magento 2.4.4 shows an error, not a warning when using deprecated functionality for PHP 8.1

[m2-amn]

Preconditions and environment

• Magento 2.4.4
• PHP 8.1
  The release notes for Mangento 2.4.4 state that Magento 2.4.4 is compatible with PHP 8.1.

Steps to reproduce

Using deprecated functionality for PHP 8.1

Expected result

When using deprecated functionality for PHP 8.1, it's expected to be shown as a warning, not as an error.
It should be different from the update that doesn't have backward compatibility.

Actual result

An error occurs instead of a warning

Additional information

No response

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @m2-amn. Thank you for your report.
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[m2-assistant]

Hi @engcom-Dash. Thank you for working on this issue.
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[m2-assistant]

Hi @engcom-Lima. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

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[engcom-Lima]

Hi @m2-amn ,

Thanks for your contribution and collaboration.

Kindly provide more information regarding the steps to reproduce the issue. So, that we can proceed further process.

Thanks

[m2-amn]

Hello @engcom-Lima,

Thank you for your support.

Here is more information about errors.
Magento 2.4.4 shows an error to pass null as an argument of a deprecated functionality for PHP 8.1 other than that that explicitly allow null.
For instance:
strlen(), nl2br()

An error is like below
Deprecated Functionality: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/app/code///***.php on line xxxx

Thank you

[engcom-Lima]

Hi m2-amn ,

I have tried to reproduce the issue but issue is not reproducible to me.
I have used strlen(),nl2br() in index.php but I didn't got any error in logs as well as on frontend.
Kindly provide more information, so , that issue can be reproducible.

Thanks

[m2-amn]

Hello @engcom-Lima,

It seems that other factors are involved, so please put this matter on hold at present.
Thank you for your time.

[pmonosolo]

Hello @engcom-Lima,

It seems that other factors are involved, so please put this matter on hold at present. Thank you for your time.

Can you please let us know what did you find? I'm hitting the same issue on 2.4.5:
#35901