[M365] Invalid MIME content-length header encountered on read

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Hello all,

I got a 2021 error on a job targeting OneDrive. Our Veeam is on 8.2 last version. Nothing unusual.
Case is 07887382. I'm about to send the logs for a third time with no clear explanation.

[20.11.2025 00:04:33.293] 107 (1) [Warning] Warning: Failed to backup item version: /_vti_history/7168/Documents/XXX.pst, version: 14.0, Invalid MIME content-length header encountered on read.
[20.11.2025 00:04:33.293] 107 (1) [Warning] Warning: Invalid MIME content-length header encountered on read.
[20.11.2025 00:04:33.293] 107 (1) [Warning] Type: System.FormatException
[20.11.2025 00:04:33.293] 107 (1) [Warning] Stack:
[20.11.2025 00:04:33.293] 107 (1) [Warning] at Microsoft.SharePoint.Client.Mime.MimeReader.ReadHeaders(Int32 maxBuffer, Int32& remaining)

Thanks !