Bug#983457:

[Mathieu Malaterre <malat@debian.org>]

Control: found -1 2.31-13+deb11u3

Same for bpo:

% file /lib32/libpthread-2.31.so /lib/x86_64-linux-gnu/libpthread-2.31.so
/lib32/libpthread-2.31.so:                ELF 32-bit LSB shared
object, Intel 80386, version 1 (SYSV), dynamically linked, interpreter
/lib/ld-linux.so.2,
BuildID[sha1]=e4a9da11c83d819971e1007d0e0cb68b56fc99dd, for GNU/Linux
3.2.0, not stripped
/lib/x86_64-linux-gnu/libpthread-2.31.so: ELF 64-bit LSB shared
object, x86-64, version 1 (SYSV), dynamically linked, interpreter
/lib64/ld-linux-x86-64.so.2,
BuildID[sha1]=5018237bbf012b4094027fd0b96fc22a24496ea4, for GNU/Linux
3.2.0, not stripped