Looks good to me
DB<3> l 1-6
1 #!/bin/perl -w
2: use strict;
3==> $_ = shift // ''; # line 3
4: s{a([bc])} # 4
5 {d$1}g; # 5
6: print; # 6
DB<4>
You can't break at 5 though, because the multi-line statement starts at 4.
Semicolons matter!
Edit
Please try recreating the file and test again.
$ cat db_tst.pl
#!/bin/perl -w
use strict;
$_ = shift // ''; # line 3
s{a([bc])} # 4
{d$1}g; # 5
print; # 6
Do you probably have a weird line ending (from windows?) after the shebang?
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