The report also describes v2 output being rejected by joinpsbts, an RPC that accepts only v0 files. External signing software may face similar trouble if it lacks v2 support.
GitHub shows a verified, signed v32.0 final source tag dated Oct. 21. The official download page still advertised 31.1 when checked Oct. 22, so the tag alone should not be read as confirmation that 32.0 binaries are available.
Maintainer fanquake moved the compatibility issue to 32.1 on Oct. 21, saying 32.0 was overdue and there was not yet a fix ready to backport. Pull request 36539 proposes restoring GUI-created PSBTs to v0 and remained open at the Oct. 22 check. CryptoSlate’s September release-candidate coverage had flagged the RPC format-default changes; the GUI fix’s deferral is the later development.
How to avoid the PSBT format mismatch
Mixed-version co-signers can choose v0 when creating the file through Core 32’s RPC interface, using psbt_version=0 with walletcreatefundedpsbt or createpsbt. The v32.0 functional tests cover both format versions and check that the decoded output matches the requested version.
BIP 370 also permits converting an existing v2 PSBT to v0 by reconstructing its unsigned transaction, but does not itself provide an operator command.
