umlaut (e.g. ü) in name of directory causes problem after sharing the directory to group

[vosteen]

Steps to reproduce

1. Create an directory with an german umlaut as "ä" or "ü". In my case "UniLübeck"
2. Upload a PDF-file into this directory or a subdirectory.
3. share the directory with the umlaut to a group.

Expected behaviour

They should be able to open the document.

Actual behaviour

All members of the group I shared the directory with (besides me) cannot open the document while I (owner of the directory) can.
PDF.js v1.9.426 (build: 2558a58d)Message: Unexpected server response (500) is shown to them.

Server configuration

Operating system:
debian 9
Web server:
Apache/2.4.25 (Debian)
Database:
10.1.26-MariaDB-0+deb9u1 Debian 9.1
PHP version:
PHP 7.3.
Nextcloud version:
14.0.3
Updated from an older Nextcloud/ownCloud or fresh install:
updated

If other details are needed please inform me.

[nextcloud-bot]

GitMate.io thinks possibly related issues are #3786 (Directory name), #8028 (Security problem / sharing options), #10534 (Email notification is not sent upon directory share to group of users), #2400 (Writing in a directory shared with an AD group is very slow), and #5273 (Problem while sharing with LDAP groups since NC 12.0.0 upgrade).

[violoncelloCH]

I couldn't reproduce this with Firefox 62 on Windows
@fuchsstein could you tell the Browser and OS the share recievers (and you) use?
Can you also check if the problem happens with every document in this folder?

[vosteen]

I cannot reproduce the error anymore; even by doing the same steps I recall doing the first time and using the precise same names.

By that I close this bug report because I failed collecting enough information the time it did not work – for which I am sorry.

(
To answer your question anyway:
One user uses Firefox Quantum 63.0 64-bit on Arch Linux 4.18.16 under which it did not work.
Under 60.2.0esr (64-bit) on Kali GNU/Linux Rolling (my system) it worked with the user sharing the directory and failed with a testing user I created for reproduction.
The error appeared with every Document I tested (random sample of ~10 out of ~50).
)

[violoncelloCH]

Thank you
Feel free to open a new issue if you can reproduce the error.