valgrind false positive on R startup?

Hi all,

I'm on Ubuntu 18.04, running R-4.0.0 which I compiled from source, and
using valgrind I am always seeing the following message. Does anybody
else see that? Is that a known false positive? Any ideas how to
fix/suppress? Seems related to TRE, do I need to upgrade that?

(base) tdhock at maude-MacBookPro:~/R/binsegRcpp$ R --vanilla -d valgrind
-e 'extSoftVersion()'
==9565== Memcheck, a memory error detector
==9565== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==9565== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==9565== Command: /home/tdhock/lib/R/bin/exec/R --vanilla -e extSoftVersion()
==9565==
==9565== Conditional jump or move depends on uninitialised value(s)
==9565==    at 0x55AB9E0: __wcsnlen_sse4_1 (strlen.S:147)
==9565==    by 0x5598EC1: wcsrtombs (wcsrtombs.c:104)
==9565==    by 0x551EB20: wcstombs (wcstombs.c:34)
==9565==    by 0x50BAA07: wcstombs (stdlib.h:154)
==9565==    by 0x50BAA07: tre_parse_bracket_items (tre-parse.c:336)
==9565==    by 0x50BAA07: tre_parse_bracket (tre-parse.c:453)
==9565==    by 0x50BAA07: tre_parse (tre-parse.c:1380)
==9565==    by 0x50B2498: tre_compile (tre-compile.c:1920)
==9565==    by 0x50AFBE0: tre_regcompb (regcomp.c:150)
==9565==    by 0x4FA9F42: do_gsub (grep.c:2023)
==9565==    by 0x4F79045: bcEval (eval.c:7090)
==9565==    by 0x4F8572F: Rf_eval (eval.c:723)
==9565==    by 0x4F8754E: R_execClosure (eval.c:1888)
==9565==    by 0x4F88316: Rf_applyClosure (eval.c:1814)
==9565==    by 0x4F85902: Rf_eval (eval.c:846)
==9565==

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extSoftVersion()

                                 zlib                                bzlib
                             "1.2.11"                 "1.0.6, 6-Sept-2010"
                                   xz                                 PCRE
                              "5.2.2"                   "10.31 2018-02-12"
                                  ICU                                  TRE
                               "60.2"            "TRE 0.8.0 R_fixes (BSD)"
                                iconv                             readline
                         "glibc 2.27"                                "7.0"
                                 BLAS
"/home/tdhock/lib/R/lib/libRblas.so"

==9565==
==9565== HEAP SUMMARY:
==9565==     in use at exit: 40,492,919 bytes in 9,170 blocks
==9565==   total heap usage: 19,784 allocs, 10,614 frees, 62,951,535
bytes allocated
==9565==
==9565== LEAK SUMMARY:
==9565==    definitely lost: 0 bytes in 0 blocks
==9565==    indirectly lost: 0 bytes in 0 blocks
==9565==      possibly lost: 0 bytes in 0 blocks
==9565==    still reachable: 40,492,919 bytes in 9,170 blocks
==9565==                       of which reachable via heuristic:
==9565==                         newarray           : 4,264 bytes in 1 blocks
==9565==         suppressed: 0 bytes in 0 blocks
==9565== Rerun with --leak-check=full to see details of leaked memory
==9565==
==9565== For counts of detected and suppressed errors, rerun with: -v
==9565== Use --track-origins=yes to see where uninitialised values come from
==9565== ERROR SUMMARY: 46 errors from 1 contexts (suppressed: 0 from 0)
(base) tdhock at maude-MacBookPro:~/R/binsegRcpp$