Str::mask get wrong result when first letter equal to second letter

[FuS1]

• Laravel Version: 8.83.16
• PHP Version: 7.4.3
• Database Driver & Version: null

Description:

Str::mask('abcde', '', 1, -1); =>"ae"
Str::mask('aaaba', '', 1, 3); => "aa"
Str::mask('abcde', '', -4, 3); =>"ae"
Str::mask('aaaba', '', -4, 3); =>"a**a"

But I below case will get wrong result string

Str::mask('aaaaa', '*', 1, -1); => "**aa"
Str::mask('aaaab', '', 1,3); => "**ab"
Str::mask('aaaaa', '', -4, 3); => "**aa"
Str::mask('aaaab', '', -4, 3); => "***ab"

Steps To Reproduce:

[nielsdos]

This does like the occurrence of this issue: #42295 (which was fixed in 9.x) in 8.x

[BrandonSurowiec]

You can make a PR to backport #42295 to 8.x as bug fixes are still accepted there.

[FuS1]

OK，thanks all