Decryption fails with "MalformedPacket: Permission denied to access property 'autoAllocateChunkSize'" when parsing CompressedDataPacket

[martgil]

Description:

Summary
A user is unable to decrypt an incoming PGP message using the FlowCrypt browser extension. The message fails with an error referencing CompressedDataPacket parsing and a Permission denied error on the autoAllocateChunkSize property.

Error message

Could not open this message with FlowCrypt.
other: MalformedPacketParsing CompressedDataPacket failed: Permission denied to access property "autoAllocateChunkSize"

Steps to reproduce

1. Receive a PGP-encrypted message (details below).
2. Attempt to decrypt it directly within the FlowCrypt browser extension.
3. Decryption fails with the error above.

Additional context

• The user noted that forwarding the message causes it to decrypt automatically in the forwarded message panel, which is a separate concern since it would expose the original content to the forward recipient without the sender's consent.
• Troubleshooting on our end confirmed the message was encrypted correctly using the recipient's public key, so the issue appears to be on the decryption/parsing side within the extension.
• Sample of the affected PGP message is attached/available for reference (truncated for brevity).

Environment

• Product: FlowCrypt browser extension version 8.5.14
• Browser used: Mozilla Firefox 153

Reference: https://mail.google.com/mail/u/human@flowcrypt.com/#inbox/FMfcgzQhVhdxQFPFNwzFGZhzNgxfxkTg