Problem: NC 20 + Encyption + External Storage

Hi

I have an external (local) storage directory and file encryption is turned on. When I put files into the external storage or I remove files, I get error messages related to Crypto.php

Put a file:

Error: hex2bin(): Hexadecimal input string must have an even length at /www/htdocs/[…]/lib/private/Security/Crypto.php#125

Error: hex2bin(): Input string must be hexadecimal string at /www/htdocs/[…]/lib/private/Security/Crypto.php#127

Error: hash_equals(): Expected user_string to be a string, bool given at /www/htdocs/[…]/lib/private/Security/Crypto.php#138

Error: hex2bin(): Hexadecimal input string must have an even length at /www/htdocs/[…]/lib/private/Security/Crypto.php#125

Error: hex2bin(): Input string must be hexadecimal string at /www/htdocs/[…]/lib/private/Security/Crypto.php#127

Error: hash_equals(): Expected user_string to be a string, bool given at /www/htdocs/[…]/lib/private/Security/Crypto.php#138

Remove a file:

Error: hex2bin(): Hexadecimal input string must have an even length at /www/htdocs/[…]/lib/private/Security/Crypto.php#125

Error: hex2bin(): Input string must be hexadecimal string at /www/htdocs/[…]/lib/private/Security/Crypto.php#127

Error: hash_equals(): Expected user_string to be a string, bool given at /www/htdocs/[…]/lib/private/Security/Crypto.php#138

Nextcloud version: 20.0.0
Operating system and version: Linux 4.15.0-117-generic x86_64
Apache or nginx version:
PHP version: 7.4.10

Does anyone else have these problems? Any solutions?

Cheers,
Ralph