since ios18.3 mail, imap "append" command fails with error message containing "expected digit"

[mjl-]

Example:

m="C: AV2 ID (\"name\" \"com.apple.email.maild\" \"version\" \"3826.400.131.2.14\" \"os\" \"iOS\" \"os-version\" \"18.3 (22D63)\" \"vendor\" \"Apple Inc\")\r\n"
m="S: * ID (\"name\" \"mox\" \"version\" \"v0.0.15-0.20250203172848-d08e0d3882dd-go1.23.5\")\r\nAV2 OK ID done\r\n"

m="C: AV68 APPEND \"Sent\" (\\Seen) \"3-Feb-2025 18:28:47 +0000\" {311+}\r\nContent-Type: text/plain;\r\n\tcharset=us-ascii\r\nContent-Transfer-Encoding: 7bit\r\nFrom: ..."
m="imap syntax error" pkg=imapserver lastline="AV68 APPEND \"Sent\" (\\Seen) \"3-Feb-2025 18:28:47 +0000\" {311+}"
m="S: AV68 BAD APPEND unrecognized syntax/command: expected digit (remaining \"-Feb-2025 18:28:47 +0000\\\" {311+}\")\r\n"

I think the "3-Feb-2025 18:28:47 +0000" should be " 3-Feb-2025 18:28:47 +0000" (missing space):

https://www.xmox.nl/xr/dev/rfc/9051.html#L6325
https://www.xmox.nl/xr/dev/rfc/9051.html#L6502
https://www.xmox.nl/xr/dev/rfc/9051.html#L6492

Will report at https://feedbackassistant.apple.com.
May be better to stay on ios18.2 for now.

[mjl-]

Update: This has NOT been fixed yet in ios 18.3.1.

[mjl-]

If you run into this, please also report it to apple. They are hinting (with "Recent Similar Reports: ...") that they are prioritizing bugs by how many reports they get about them.