I came across this bug from Wookey linking to it from the debian-arm mailing list. I also ran into this bug in Guix and I managed to track down an upstream bug report about it¹. Short version is that upstream now knows about it, and tar-1.35 will default to enabling 64-bit time_t.
¹ https://lists.gnu.org/archive/html/bug-tar/2021-10/msg00006.html -- Efraim Flashner <efr...@flashner.co.il> אפרים פלשנר GPG key = A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Confidentiality cannot be guaranteed on emails sent or received unencrypted
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