Editing message with a built-in editor results in attachment with .dat extension

[link2xt]

With core 1.154.1 and latest Android code, after editing the image on Android and sending, receivers (both Desktop and Android) get filename with .dat and it is not displayed as image.

Logs look like this:

18040.7s [i]core/event: 65 src/imap.rs:1464: Passing message UID 24045 to receive_imf().
18040.7s [i]core/event: 257 src/imap.rs:755: 0 mails read from "INBOX".
18040.8s [D]core/event: NewBlobFile 65 { file: '$BLOBDIR/image_2025-01-16_01-53-12.dat', kind: 'NewBlobFile' }
18040.8s [i]core/event: 65 src/mimeparser.rs:1397: added blobfile: "$BLOBDIR/image_2025-01-16_01-53-12.dat"

I have also seen files with blob names null-1(invalid)-1(invalid) and null-4(invalid)(invalid).
These (invalid) strings seem to be generated here:

deltachat-android/src/main/java/org/thoughtcrime/securesms/util/FileUtils.java

Line 9 in b398870

return "(invalid)";

Likely caused by #3521

[link2xt]

Looking at the actual message decrypted, it has

Content-Disposition: attachment; filename="image_2025-01-16_01-52-03.dat"