File decryption hanging for 20 minutes before failing

Describe the bug
Decryption fails on encrypted video file inside encrypted folder

To Reproduce
Steps to reproduce the behavior:

1. Encrypt folder containing pictures and videos
2. Open encrypted folder (no password required)
3. Tap on 3 dots menu of encrypted video file (70MB)
4. Type password and press OK
5. Decrypted video file is created and shows corrupt file icon and its size is 0B. Notification is stuck on time remaining unknown and transfer rate unknown
6. Decryption stops after several minutes and Amaze reports it couldn't decrypt the file

Expected behavior
Decrypted video file is created and can be opened normally after a reasonable amount of time

Screenshots
If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: bq Aquaris X2 Pro
• OS: Android Pie 9 (Android One)
• Rooted: no
• Version: not sure about this question

See logcat attached.
amaze.log

Start by reproducing the listed steps with a 70MB encrypted video inside an encrypted folder, then inspect the attached amaze.log and trace the Android file-decryption entry point. Done means decryption completes in a reasonable time and produces a non-empty video that opens normally.