[perl #124368] Perl_sv_2pv_flags: Assertion `((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed

I minimized the attached test case with afl-tmin from 469 bytes to 50 bytes, however, the minimized test case didn't cause the assertion failure and caused GDB and Valgrind to hang. 

Reduced test case:
map{s[][]o=~@0,$0[0]>map{0?{s()()}:0}0}<>__END__
0

Hexdump:
0000000 616d 7b70 5b73 5b5d 6f5d 7e3d 3040 242c
0000010 5b30 5d30 6d3e 7061 307b 7b3f 2873 2829
0000020 7d29 303a 307d 3c7d 5f3e 455f 444e 5f5f
0000030 300a                                   
0000032

• [perl #124368] Perl_sv_2pv_flags: Assertion `((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Brian Carpenter via RT
• Re: [perl #124368] Perl_sv_2pv_flags: Assertion`((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags &0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Dave Mitchell
• [perl #124368] Perl_sv_2pv_flags: Assertion `((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Tony Cook via RT
• Re: [perl #124368] Perl_sv_2pv_flags: Assertion`((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags &0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Dave Mitchell
• [perl #124368] Perl_sv_2pv_flags: Assertion `((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Hugo van der Sanden via RT
• [perl #124368] Perl_sv_2pv_flags: Assertion `((svtype)((sv)->sv_flags & 0xff)) != SVt_PVAV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVHV && ((svtype)((sv)->sv_flags & 0xff)) != SVt_PVFM' failed by Brian Carpenter