Cannot update watermarking tag list after first set

[maximelehericy]

Describe the bug Under Settings > Nextcloud Office The dropdown list of show watermark on tagged files is not showing id there were previsously selected tags

To Reproduce Steps to reproduce the behavior:

1. Go to Nextcloud Office settings
2. Enable watermarking
3. Tick enable watermaking for tagged files
4. click the drop down and select a few tags
5. Refresh the page
6. The tag field is empty, and clicking on it shows no dropdown.
7. Your not able to modify the list of tags activatingf watermarks

NB: after UPDATE oc_appconfig SET configvalue='' WHERE appid='files' AND configkey='watermark_allTagsList' tags are selectable again.

Expected behavior Dropdown should show up and you should be able to modify the tags enabling watermarks.

Screenshots

Client details:

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]
• Device: [e.g. iPhone6, desktop]

Server details

Operating system:

Web server:

Database:

PHP version:

Nextcloud version:

Version of the richdocuments app

Version of Collabora Online

Configuration of the richdocuments app

Insert the output of `./occ config:list richdocuments` (or equivalent adapted for your runtime environment)

Logs

Nextcloud log (data/nextcloud.log)

Insert your Nextcloud log here

Browser log

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a) The javascript console log
b) The network log
c) ...